Interstellar hydroxyl and water masers and formaldehyde masers and dasars

A review of the observational data on anomalous emission by OH, H2O and H2CO molecules and on anomalous absorption by H2CO molecules. Various theories advanced to account for these data and some models of a few particular sources are discussed.

[1]  Alexander Davydov,et al.  Quantum Mechanics , 2019, Stars and Stellar Processes.

[2]  A. H. Barrett,et al.  Time variation of the H2O maser and infrared continuum in late-type stars , 1974 .

[3]  O. E. H. RYDBECK,et al.  Radio Detection of Interstellar CH , 1973, Nature.

[4]  G. Knapp,et al.  OH observations of 16 interstellar dust clouds , 1973 .

[5]  W. Goss,et al.  Accurate positions of OH emission sources at 1665 and 1667 MHz , 1973 .

[6]  B. Zuckerman.  A Model of the Orion Nebula , 1973 .

[7]  M. Krauss,et al.  Dissociative Recombination E + CH^{+} (Χ^{1}Σ^{+}). , 1973 .

[8]  N. H. Dieter.  A survey of interstellar formaldehyde in dust clouds , 1973 .

[9]  T. D. Jong.  Water masers in a protostellar gas cloud , 1973 .

[10]  C. Heiles.  Measurements of the H$sub 2$CO 6-centimeter excitation temperature. I. Dark dust clouds , 1973 .

[11]  C. Heiles,et al.  Absence of H$sub 2$CO 6-centimeter hyperfine anomalies in a dust cloud , 1973 .

[12]  M. Litvak.  Radiative transport in interstellar masers , 1973 .

[13]  R. Crutcher.  Concerning anomalous formaldehyde hyperfine lines in the dust cloud L1436 , 1973 .

[14]  K. Johnston,et al.  Thirteen new H$sub 2$O sources associated with OH emission in H II regions , 1973 .

[15]  E. Fomalont,et al.  Interferometric observations of formaldehyde absorption in front of strong galactic sources , 1973 .

[16]  W. D. Watson.  Deuterium in Interstellar Molecules , 1973 .

[17]  D. Haar,et al.  On the Polarization of the Interstellar OH-Emission , 1973 .

[18]  T. Woodruff,et al.  Microwave Water Vapor Emmision from Galactic Sources , 1973 .

[19]  P. Goldreich,et al.  Astrophysical Masers. 111. Trapped Infrared Lines and Cross-Relaxation , 1973 .

[20]  W. D. Watson.  Formation of the HD Molecule in the Interstellar Medium , 1973 .

[21]  E. Chaisson,et al.  Long-period variables: correlation of stellar period with OH radial- velocity pattern , 1973 .

[22]  M. Gordon,et al.  The Radio Detection of a Giant Dust Complex in the Perseus Arm , 1973 .

[23]  M. Gordon,et al.  The Absence of Formaldehyde Radiation Toward Cold Regions of the Galactic Plane: Further Investigation , 1973 .

[24]  R. McCray,et al.  The Formation of Interstellar Molecules from Negative Ions , 1973 .

[25]  N. Woolf,et al.  Interstellar Deuterium: Chemical Fractionation , 1973 .

[26]  A. H. Barrett,et al.  New H20 sources associated with infrared stars. , 1973 .

[27]  P. Bender,et al.  Analytic Approximation for the Saturation Behavior of OH Emission Regions , 1973 .

[28]  P. Aannestad.  Molecule Formation. II. In Interstellar Shock Waves , 1973 .

[29]  P. Aannestad.  Molecule Formation. I. In Normal HI Clouds , 1973 .

[30]  W. Goss,et al.  Excitation of Interstellar OH by the Collisional Dissociation of Water , 1973 .

[31]  R. Larson.  A Simple Probabilistic Theory of Fragmentation , 1973 .

[32]  N. Scoville,et al.  Molecular Clouds in W49 and W51 , 1973 .

[33]  N. Scoville,et al.  Survey of Molecular Lines Near the Galactic Center. III. 6-CENTIMETER Formaldehyde Absorption at B = -2' from L = 2degrees.0 to L = 4degrees.5 and at B = 121 from L = 358degrees.5 to L = 2degrees.0 , 1973 .

[34]  P. Solomon,et al.  The formation of diatomic molecules in interstellar clouds. , 1972 .

[35]  R. Wilson,et al.  ^{13}C^{16}O/^{12}C^{18}O Ratios in Nine H II Regions , 1972 .

[36]  G. Neugebauer,et al.  Infrared stars with strong 1665/1667-MHz OH microwave emission. , 1972 .

[37]  G. Neugebauer,et al.  Infra-Red Sources in the H II Region W3 , 1972 .

[38]  N. Evans,et al.  Statistics of the radiation from astronomical masers. , 1972 .

[39]  A. Selden.  Gain parameters of interstellar masers , 1972 .

[40]  L. Allen,et al.  Models for OH Radiation from the Interstellar Medium , 1972 .

[41]  R. Boyd,et al.  Interstellar Scattering and the Sizes of Astronomical Masers , 1972 .

[42]  P. Thaddeus,et al.  Laboratory measurement of the 2-centimeter, 2/11/-2/12/ transition of normal formaldehyde and its carbon-13 and oxygen-18 species. , 1972 .

[43]  B. Zuckerman,et al.  Millimeter Wavelength Molecular Line Observations of Infrared Sources and Dust Clouds. , 1972 .

[44]  L. Allen,et al.  Spectral linewidth in laser amplifiers and amplified spontaneous emission, and its relevance to the interstellar medium , 1972 .

[45]  L. Allen,et al.  Spectral distribution of amplified spontaneous emission , 1972 .

[46]  P. Thaddeus.  Interstellar formaldehyde. I - The collisional pumping mechanism for anomalous 6-centimeter absorption. , 1972 .

[47]  R. Davies,et al.  The Variability of the OH Source W3 , 1972 .

[48]  R. Larson.  The Evolution of Spherical Protostars with Masses $0\cdot\,25\,{M}_{\odot}\,\text{TO}\,10\,{M}_{\odot}$ , 1972 .

[49]  L. Allen,et al.  Amplified spontaneous emission. IV. Beam divergence and spatial coherence , 1972 .

[50]  Richard B. Larson,et al.  The Collapse of a Rotating Cloud , 1972 .

[51]  R. Davies,et al.  Physical Conditions in Interstellar Hydroxyl and Formaldehyde Clouds , 1972 .

[52]  W. Welch,et al.  Interstellar Molecules and Dense Clouds , 1971, Science.

[53]  M. Krauss,et al.  Formation of OH Through Inverse Predissociation , 1971 .

[54]  P. Thaddeus,et al.  6-centimeter formaldehyde absorption and emission in the Orion Nebula , 1971 .

[55]  R. Wilson,et al.  DISCOVERY OF PARA-FORMALDEHYDE AND THE 2-MILLIMETER FORMALDEHYDE DISTRIBUTION IN THE ORION INFRARED NEBULA. , 1971 .

[56]  R. Davies,et al.  Interferometric Investigations of Sources of OH Emission — I: Observations with an Interferometer Baseline of 7 × 105 Wavelengths , 1971 .

[57]  W. Goss,et al.  New OH Emission Sources , 1971, Publications of the Astronomical Society of Australia.

[58]  L. Allen,et al.  Amplified spontaneous emission III. Intensity and saturation , 1971 .

[59]  D. Haar,et al.  Elements of Hamiltonian mechanics. , 1971 .

[60]  L. Allen,et al.  Amplified spontaneous emission. II. The connection with laser theory , 1971 .

[61]  L. Allen,et al.  Amplified spontaneous emission I. The threshold condition , 1971 .

[62]  R. Wilson,et al.  Observation of 140-GHz formaldehyde line emission from the trapezium region of the Orion nebula , 1971 .

[63]  M. Litvak.  Linewidths of a Gaussian Broadband Signal in a Saturated Two-Level System , 1970 .

[64]  J. Moran,et al.  Very Long Baseline Interferometry of Galactic OH Sources , 1970 .

[65]  A. H. Barrett,et al.  Observations of the ^{2}Π_{1/2}, J = 1/2 State of OH , 1970 .

[66]  M. Litvak.  Polarized Maser Emission from Interstellar OH and H 2 O , 1970 .

[67]  C. Hansen,et al.  Possible Pulsar Formation Mechanism via Thermonuclear Detonation in Collapsing Degenerate Cores , 1970 .

[68]  P. Thaddeus,et al.  Precise Laboratory Measurement of the 4830-MHZ Formaldehyde Rotational Transition , 1970 .

[69]  George R. Carruthers,et al.  Rocket observation of interstellar molecular hydrogen , 1970 .

[70]  K. Evenson,et al.  Infrared Resonance of OH With the H 2 O Laser: A Galactic Maser Pump? , 1970 .

[71]  B. Zuckerman,et al.  Detection of the ^{2}Π_{3/2}, J = 7/2 State of Interstellar OH at a Wavelength of 2.2 Centimeters , 1970 .

[72]  A. H. Barrett,et al.  OH RADIO EMISSION ASSOCIATED WITH INFRARED STARS. , 1970 .

[73]  W. Sullivan,et al.  Studies of H2O sources by means of a very- long-baseline interferometer , 1970 .

[74]  T. Oka.  ON THE INITIAL EXCITATION TEMPERATURE OF INTERSTELLAR $H_{2}CO$ MOLECULES , 1970 .

[75]  D. Buhl,et al.  Observations of Interstellar Formaldehyde , 1970 .

[76]  J. Ball,et al.  Search for ^{18}OH in Emission , 1970 .

[77]  Patrick Palmer,et al.  Observations of the ^2II_{1/2},J=1/2 State of Interstellar OH , 1970 .

[78]  J. L. Yen,et al.  Observations of the 2 Π {3/2} J = {5/2} State of Interstellar OH , 1970 .

[79]  L. Allen,et al.  Superradiance, coherence brightening and amplified spontaneous emission , 1970 .

[80]  A. H. Barrett,et al.  Erratum: Observations of Water-Vapor Emission Associated with Infrared Stars , 1970 .

[81]  A. H. Barrett,et al.  An investigation of the spectra and time variations of galactic water-vapor sources , 1969 .

[82]  G. Neugebauer,et al.  Observations of the infrared object, VY Canis Majoris , 1969 .

[83]  W. Sullivan,et al.  Galactic Water Vapor Emission: Further Observations of Variability , 1969, Science.

[84]  D. Buhl,et al.  Detection of Interstellar H_{2}C^{13}O^{16} , 1969 .

[85]  J. Whiteoak,et al.  Radio Observations of Interstellar Formaldehyde , 1969, Publications of the Astronomical Society of Australia.

[86]  M. Litvak.  Hydroxyl and water masers in protostars. , 1969, Science.

[87]  C. Townes,et al.  A pumping mechanism for anomalous microwave absorption in formaldehyde in interstellar space. , 1969 .

[88]  Richard B. Larson,et al.  Numerical Calculations of the Dynamics of a Collapsing Proto-Star , 1969 .

[89]  A. H. Barrett,et al.  Observations of the ^{2}Π_{1/2}, J = 5/2 Excited State of OH in W3 , 1969 .

[90]  Robert B. Leighton,et al.  Two-micron sky survey : a preliminary catalog , 1969 .

[91]  A. H. Barrett,et al.  Water Vapor: Observations of Galactic Sources , 1969, Science.

[92]  M. Maheswaran.  Effects of prescribed circulations of magnetic fields , 1969 .

[93]  W. Welch,et al.  Further Microwave Emission Lines and Clouds of Ammonia in our Galaxy , 1969, Nature.

[94]  C. Townes,et al.  Spectra, Variability, Size, and Polarization of H2O Microwave Emission Sources in the Galaxy , 1969, Science.

[95]  A. Cook.  The hydroxyl molecule in interstellar space , 1969 .

[96]  W. Welch,et al.  Detection of NH sub 3 molecules in the interstellar medium by their microwave emission. , 1968 .

[97]  J. Z. Holtz.  ENERGY REQUIREMENTS AND MECHANISMS FOR OH GALACTIC MASERS. , 1968 .

[98]  J. Ball,et al.  Classification of OH radio emission sources. , 1968 .

[99]  A. E. Lilley,et al.  Detection of Microwave Radiation from the ^{2}Π_{1/2}, J = 1/2 State of OH , 1968 .

[100]  A. Cook.  Elementary models for stimulated radio emission from interstellar OH , 1968 .

[101]  A. H. Barrett,et al.  The structure of the OH source in W3. , 1968 .

[102]  C. V. Heer,et al.  Polarization of an amplifying medium and of cosmic OH radiation , 1968 .

[103]  P. Solomon,et al.  Formation and Chemical Pumping of OH Molecules , 1968, Nature.

[104]  Richard T. Hall,et al.  Pure Rotational Spectrum of Water Vapor , 1967 .

[105]  B. Robinson,et al.  OH Molecules in the Interstellar Medium , 1967 .

[106]  C. V. Heer,et al.  Theory for the anomalous polarization of cosmic OH-18-cm radiation and for hyperfine lasers☆ , 1967 .

[107]  Frank J. Low,et al.  Discovery of an infrared nebula in Orion. , 1967 .

[108]  G. B. Spindler,et al.  The Chemiluminescent Reaction O + H → OH + hν , 1967, Nature.

[109]  J. W. Haas,et al.  Sodium Naphthalenide–Alkyl Halide Chemiluminescence , 1967, Nature.

[110]  C. V. Heer,et al.  Theory for the polarization of the four cosmic OH 18-cm lines , 1967 .

[111]  V. Reddish.  The Dependence of Interstellar Reddening on Luminosity Amongst O and B Stars , 1967 .

[112]  G. Neugebauer,et al.  Observations of an infrared star in the Orion nebula. , 1967 .

[113]  A. L. McWhorter,et al.  Maser Model for Interstellar OH Microwave Emission , 1966 .

[114]  C. V. Heer.  Theory for the Polarization of Cosmic OH−18-cm Radiation , 1966 .

[115]  V. Derr,et al.  Millimeter wave rotational transitions and the Stark effect of the water molecule , 1966 .

[116]  A. Cook,et al.  Determination of Direction, Frequency and Polarization of Radio Emission from Galactic OH , 1966, Nature.

[117]  D. Downes,et al.  Microwave Observations of the Cygnus X Region , 1966 .

[118]  A. Cook.  Suggested Mechanism for the Anomalous Excitation of OH Microwave Emissions from H-II Regions , 1966, Nature.

[119]  R. Davies,et al.  Detection of Circular and Linear Polarization in the OH Emission Sources near W3 and W49 , 1966, Nature.

[120]  H. D. Lang,et al.  Nonlinear preference for circular mode polarization observed on various lasing neon transitions , 1966 .

[121]  E. Salpeter,et al.  Maser Action in Interstellar OH , 1966 .

[122]  J. Symonds.  Formation of Hydroxyl Molecules in Interstellar Space , 1965, Nature.

[123]  J. G. Bolton,et al.  Anomalous Intensity Ratios of the Interstellar Lines of OH in Absorption and Emission , 1965, Nature.

[124]  C. V. Heer,et al.  Theory of magnetic effects in optical maser amplifiers and oscillators. , 1965 .

[125]  N. H. Dieter,et al.  Observations of a Strong Unidentified Microwave Line and of Emission from the OH Molecule , 1965, Nature.

[126]  J. G. Bolton,et al.  Distribution and Motions of OH Near the Galactic Centre , 1964, Nature.

[127]  J. G. Bolton,et al.  Detection of the Interstellar OH Lines at 1612 and 1720 Mc/sec , 1964 .

[128]  W. Lamb.  Theory of an optical maser , 1964 .

[129]  A. H. Barrett,et al.  High-resolution Microwave Spectra of H and OH Absorption Lines of Cassiopeia A , 1964, Nature.

[130]  D. Williams,et al.  OH Absorption Profile in the Direction of Sagittarius A , 1964, Nature.

[131]  F. S. Mathews,et al.  Crystal and Molecular Structure of N-Methyl Cytosine , 1964, Nature.

[132]  A. H. Barrett,et al.  Radio Observations of OH in the Interstellar Medium , 1963, Nature.

[133]  H. Radford.  Microwave Zeeman Effect of Free Hydroxyl Radicals: 2 Π 12 Levels , 1962 .

[134]  B. T. Lynds.  Catalogue of Dark Nebulae. , 1962 .

[135]  P. Thaddeus,et al.  Hyperfine Structure in the Microwave Spectrum of HDO, HDS, CH2O, and CHDO : Beam‐Maser Spectroscopy on Asymmetric‐Top Molecules , 1961 .

[136]  H. Radford.  Microwave Zeeman Effect of Free Hydroxyl Radicals , 1961 .

[137]  S. Sharpless.  A Catalogue of H II Regions. , 1959 .

[138]  W. Kaskan.  Abnormal Excitation of OH in H2/O2/N2 Flames , 1959 .

[139]  A. G. Gaydon,et al.  Excitation of spectra of OH in hydrogen flames and its relation to excess concentrations of free atoms , 1958, Proceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences.

[140]  A. E. Lilley,et al.  A search for the 18-cm line of OH in the interstellar medium. , 1957 .

[141]  T. M. Sanders,et al.  Microwave Spectra of the Free Radicals OH and OD , 1955 .

[142]  A. E. Lilley.  A Note on the Galactic Microwave Spectrum. , 1955 .

[143]  H. Kramers,et al.  Condensation in interstellar space , 1946 .

[144]  G. W. King,et al.  The asymmetric rotor : II. calculation of dipole intensities and line classification , 1944 .

[145]  D. Haar.  On the origin of smoke particles in the interstellar gas (Errata : 10 146) , 1943 .

[146]  T. Dunham,et al.  INTERSTELLAR NEUTRAL POTASSIUM AND NEUTRAL CALCIUM , 1937 .

[147]  S. Sofia.  PHYSICS OF THE X-RADIATION FROM CLUSTERS OF GALAXIES. , 1973 .

[148]  C. Heiles.  DIFFERING MOLECULAR LINE WIDTHS IN DENSE INTERSTELLAR CLOUDS. , 1973 .

[149]  J. Bieging,et al.  Observations of the Neutral Hydrogen Absorption Spectrum of Cygnus X-3, , 1973 .

[150]  J. Taylor,et al.  FREQUENCY DEPENDENCE OF PULSAR POLARIZATION. , 1973 .

[151]  R. Wilson,et al.  Deuterium in the Orion Nebula , 1973 .

[152]  P. Goldreich,et al.  Astrophysical Masers. 11. Polarization Properties , 1973 .

[153]  W. Welch,et al.  Interferometric Positions of the Water-Vapor Emission Sources in H II Regions , 1972 .

[154]  L. Allen,et al.  Amplified Spontaneous Emission and OH Molecules in the Interstellar Medium , 1972 .

[155]  Jr. Nerf.  Laboratory Measurement of the Millimeter-Wavelength Spectrum of Formaldehyde , 1972 .

[156]  P. Goldreich,et al.  Astrophysical Masers. I. Source Size and Saturation , 1972 .

[157]  C. Henderson.  Molecules in space. , 1972 .

[158]  R. Crutcher,et al.  OH OBSERVATIONS OF THE OPEN CLUSTER NGC 2264. , 1972 .

[159]  B. Turner.  On the Distribution of OH in the Galaxy. I. Correlation with Continuum Sources and with Formaldehyde , 1972 .

[160]  R. Davies,et al.  Structure of the OH/Infrared Object NML Cygnus , 1972 .

[161]  G. Neugebauer,et al.  Infrared observations of 1612 MHz IR/OH sources. , 1972 .

[162]  David A. Williams,et al.  CH and CH+ Formation in Ion-Molecule Reactions , 1972 .

[163]  J. Mentall,et al.  Photochemistry and lifetimes of interstellar molecules , 1972 .

[164]  J. J. Meulen,et al.  BEAM-MASER MEASUREMENTS OF THE GROUND-STATE TRANSITION FREQUENCIES OF OH. , 1972 .

[165]  N. H. Dieter.  Anomalous Hyperfine Lines in Formaldehyde in a Dust Cloud , 1972 .

[166]  P. Goldreich,et al.  On Parametric Down-Conversion in Astrophysical Masers , 1972 .

[167]  N. Scoville,et al.  SURVEY OF MOLECULAR LINES NEAR THE GALACTIC CENTER. I. 6-CENTIMETER FORMALDEHYDE ABSORPTION IN SAGITTARIUS A, SAGITTARIUS B2, AND THE GALACTIC PLANE FROM 1/sup II/ = 359.4$sup 0$ TO l/sup II/ = 2.2--. , 1972 .

[168]  Z. Svestka.  Spectra of Solar Flares , 1972 .

[169]  D. Buhl,et al.  Observations of Radio Emission from Interstellar Hydrogen Cyanide , 1971 .

[170]  L. Weliachew.  Detection of Interstellar OH in Two External Galaxies , 1971 .

[171]  K. Johnston,et al.  OBSERVATIONS OF 1.35-CENTIMETER H$sub 2$O EMISSION IN THE SOUTHERN HEMISPHERE. , 1971 .

[172]  B. Turner.  NONTHERMAL OH EMISSION IN INTERSTELLAR DUST CLOUDS. , 1971 .

[173]  Andrew M. Smith,et al.  Carbon Monoxide in the Interstellar Spectrum of Zeta Ophiuchi , 1971 .

[174]  J. Ball,et al.  Search for the ^{2}Π_{1/2}, J = 5/2 Excited State of OH in W3 , 1971 .

[175]  I. Shapiro,et al.  An interferometer map of the water-vapor sources in W49 , 1971 .

[176]  G. Rybicki,et al.  The Formation of Spectral Lines , 1971 .

[177]  M. S. Roberts,et al.  The Absence of Formaldehyde Radiation Toward Cold Regions of the Galactic Plane , 1971 .

[178]  M. Sinclair,et al.  OBSERVATIONS OF THE $sup 2$PI/sub 1/2/, J = 1/2 LINE OF OH AT 4660 MHz IN SAGITTARIUS B2. , 1971 .

[179]  W. Sullivan.  Variations in Frequency and Intensity of 1.35-CENTIMETER H_{2}O Emission Profiles in Galactic H II Regions , 1971 .

[180]  M. Litvak.  The Meaning of the OH-H_{2};O Maser Maps , 1971 .

[181]  J. Ball,et al.  Search for Extraterrestrial H_{2}^{18}O Emission , 1971 .

[182]  E. Chaisson,et al.  SEARCH FOR EXTRAGALACTIC H$sub 2$O. , 1971 .

[183]  R. Rubin,et al.  New Galactic H_{2}O Sources Associated with H II Regions , 1971 .

[184]  B. Turner.  MASERS IN SPACE , 1970 .

[185]  W. Goss,et al.  18 cm Observations of Galactic OH from Longitudes 128° to 300° , 1970 .

[186]  J. Frogel.  WATER ABSORPTION IN THE INFRARED SPECTRUM OF LONG-PERIOD VARIABLE STARS AND ASSOCIATED MICROWAVE EMISSION. , 1970 .

[187]  D. Levy,et al.  The Magnetic Resonance Spectrum of Vibrationally Excited OH and a Prediction of the Radio-Astronomy Spectrum , 1970 .

[188]  J. Ball,et al.  3.8-cm SPECTRUM OF OH: LABORATORY MEASUREMENT AND LOW-NOISE SEARCH IN W3 (OH). , 1970 .

[189]  M. Litvak.  Anomalous Absorption of Microwaves by Interstellar H_{2}CO , 1970 .

[190]  Erik L. Kollberg,et al.  OH Excited-State Emission from W75 b, and w3 OH , 1970 .

[191]  N. Evans,et al.  Microwave absorption of the 2 sub 12 to 2 sub 11 rotational transition in interstellar formaldehyde , 1970 .

[192]  B. Zuckerman,et al.  OBSERVATIONS OF INTERSTELLAR OH AT 4660 MHz. , 1970 .

[193]  A. Sandqvist.  High-Frequency-Resolution Studies of Hi, OH, and CH20 Absorption Spectra in Sagittarius A , 1970 .

[194]  P. G. Kryukov,et al.  Non-resonant feedback in lasers , 1970 .

[195]  H. Unger.  Introduction to quantum electronics , 1970 .

[196]  J. L. Yen,et al.  DETECTION OF THE $sup 2$PI/sub $sup 3$/$sub 2$/, J = $sup 5$/$sub 2$ STATE OF OH AT 5-CENTIMETER WAVELENGTH. , 1969 .

[197]  B. Turner.  OBSERVATIONS OF SATELLITE-ANOMALOUS OH EMISSION SOURCES. , 1969 .

[198]  B. Zuckerman,et al.  CONDITIONS FOR MICROWAVE RADIATION FROM EXCITED OH $lambda$-DOUBLET STATES. , 1969 .

[199]  D. Buhl,et al.  Water-Vapor Clouds in the Interstellar Medium , 1969 .

[200]  D. Buhl,et al.  Formaldehyde Absorption in Dark Nebulae , 1969 .

[201]  Erik L. Kollberg,et al.  OH AND FORMALDEHYDE RADIATION PROPERTIES OF THE W75 REGION. , 1969 .

[202]  P. Thaddeus,et al.  Probable Detection of Interstellar C^{13}H^{+}. , 1969 .

[203]  C. Heiles.  Temperatures and OH Optical Depths in Dust Clouds , 1969 .

[204]  M. Litvak.  INFRARED PUMPING OF INTERSTELLAR OH. , 1969 .

[205]  D. Buhl,et al.  MICROWAVE DETECTION OF INTERSTELLAR FORMALDEHYDE. , 1969 .

[206]  B. Turner.  A Survey for Galactic OH Emission Sources , 1969 .

[207]  C. Heiles.  Normal OH Emission and Interstellar Dust Clouds , 1968 .

[208]  H. Weaver,et al.  OBSERVATIONS OF OH EMISSION IN W3, NGC 6334, W49, W51, W75, AND ORI A. , 1968 .

[209]  B. Eliasson,et al.  POSITIONS AND STOKES PARAMETERS OF SEVEN OH EMISSION SOURCES. Report No. 1968-8. , 1968 .

[210]  P. Mezger,et al.  Protostars as Sources of Anomalous OH Emission , 1968, Nature.

[211]  W. Goss.  OH ABSORPTION IN THE GALAXY. , 1968 .

[212]  I. D. Johnston.  A MECHANISM FOR MASER ACTION OF OH MOLECULES IN INTERSTELLAR SPACE. , 1967 .

[213]  P. Bender.  POLARIZATION OF COSMIC OH 18-cm RADIATION. , 1967 .

[214]  A. Cook,et al.  Brightness and Temporal Variation of Radio Emission from Galactic OH , 1967, Nature.

[215]  T. K. Menon.  THE NATURE OF OH EMISSION SOURCES IN THE GALAXY. , 1967 .

[216]  B. Zuckerman,et al.  OBSERVATIONS OF GALACTIC OH. , 1967 .

[217]  P. Mezger,et al.  GALACTIC H II REGIONS. II. OBSERVATIONS OF THEIR HYDROGEN 109$alpha$ RECOMBINATION-LINE RADIATION AT THE FREQUENCY 5009 MHz. , 1967 .

[218]  V. A. Hughes.  Mechanism for Anomalous OH Emission from HII Regions , 1967, Nature.

[219]  B. Eliasson,et al.  Possible Relation Between an OH Source and an Infrared Object in the Orion Nebula , 1967 .

[220]  T. Oka,et al.  Microwave spectrum of formaldehyde in vibrationally excited states , 1964 .

[221]  N. H. Dieter,et al.  Radio Observations of the Interstellar OH Line at 1,667 Mc/s , 1964, Nature.