Relative quantum yield of O(1 D 2) following ozone photolysis between 275 and 325 nm

Relative values of the quantum yield of O(1D2) from the photolysis of ozone in the wavelength region 275–325 nm have been measured by observing infrared fluorescence following the reaction O(1D2) + CO2 → O(3PJ) + CO2((mnp) indicating multiply vibrationally excited CO2 with m quanta in the symmetric mode ν1, n in the (doubly degenerate) bend ν2, and p in the asymmetric stretch ν3)), using the frequency-doubled output of a narrow-band dye laser as the photolysis source. The location and shape of the falloff in O(1D2) yield near 310 nm confirms the results of previous studies made with other means of quantifying O(1D2). A “tail” in the quantum yield at longer wavelengths, not consistently observed in other experiments, is clearly evident here. The quantum yield also appears to decrease slowly at wave-lengths shorter than about 290 nm.

[1]  M. Molina,et al.  Absolute absorption cross sections of ozone in the 185- to 350-nm wavelength range , 1986 .

[2]  J. L. Kinsey,et al.  Excitation spectroscopy of jet‐cooled ozone: The Huggins system , 1986 .

[3]  T. Slanger,et al.  Products and yields from O3 photodissociation at 1576 Å , 1985 .

[4]  V. Malathy Devi,et al.  Diode laser measurements of strengths, half-widths, and temperature dependence of half-widths for CO2 spectral lines near 4.2 μm , 1984 .

[5]  J. Wiesenfeld,et al.  Time‐resolved resonance fluorescence studies of O(1D2) yields in the photodissociation of O3 at 248 and 308 nm , 1983 .

[6]  N. Goldstein,et al.  Observation by laser ionization spectroscopy of vibrationally excited nitric oxide following O(1D2) + N2O → 2NO , 1983 .

[7]  A. Ravishankara,et al.  O3 photolysis at 248 nm and O(1D2) quenching by H2O, CH4, H2, and N2O: O(3PJ) yields , 1982 .

[8]  S. Adler-Golden,et al.  Ultraviolet continuum spectroscopy of vibrationally excited ozone , 1982 .

[9]  David S. Moore,et al.  Collision-free coherent anti-stokes raman spectroscopy (cars) of molecular photofragments , 1981 .

[10]  R. Watson,et al.  Ozone photolysis: determination of the O(3P) quantum yield at 266 nm , 1980 .

[11]  R. Watson,et al.  Laser flash photolysis of ozone - O/1D/ quantum yields in the fall-off region 297-325 nm , 1980 .

[12]  P. Fairchild,et al.  Relative quantum yields of O(1D) in Ozone Photolysis in the region between 250 and 300 nm , 1978 .

[13]  F. Comes,et al.  Laser flash photolysis: Quantum yield of O(1D) formation from ozone , 1977 .

[14]  J. Wiesenfeld.  Effect of diabatic correlation on the reactions of O(2 3P, 2 1D) with N2 O and CO2 , 1977 .

[15]  G. Moortgat,et al.  Relative O(1D) Quantum Yields in the near UV Photolysis of Ozone at 298 K , 1975 .

[16]  W. Demore,et al.  Reaction of O(1D) with Nitrogen , 1962 .

[17]  E. Castellano,et al.  Photochemical Decomposition of Ozone in Yellow‐Red Light and the Mechanism of Its Thermal Decomposition , 1962 .