Multiphoton induced fluorescence and ionization of carbon monoxide (B 1Σ

The B 1Σ+ state of carbon monoxide was created by a two‐photon absorption of 230 nm laser radiation. The B 1Σ+ state was identified by the positions of the Q branch 0–0 absorption band and the vibrational bands of B 1Σ+ → A 1Π fluorescence occurring after excitation. Collision‐induced b 3Σ+ → a 3Π emission in the 350 nm region was also observed. The lifetimes of the B 1Σ+ → A 1Π and the b 3Σ+ → a 3Π emission were obtained as well as the self‐quenching rate constants and the CO (B 1Σ)) quenching rate by N2. In addition to the two‐photon laser induced fluorescence of B 1Σ+ carbon monoxide, a three‐photon resonant (2+1) ionization was observed. Laser power dependence studies indicate that ionization of the B 1Σ+ state was nearly saturated at the laser fluence used, implying that most CO (B 1Σ+) was ionized rather than fluorescing. The measured polarization ratios for circularly to linearly polarized excitation of fluorescence and ionization was much larger than the expected values suggesting that other three...

[1]  J. Bokor,et al.  Two-photon absorption, laser-induced fluorescence detection of Cl atoms , 1982 .

[2]  William K. Bischel,et al.  Two-photon laser-induced fluorescence in oxygen and nitrogen atoms , 1981 .

[3]  J. Bokor,et al.  Two-photon excitation of the n = 3 level in H and D atoms , 1981, IEEE Journal of Quantum Electronics.

[4]  H. Zacharias,et al.  Rotational line strengths in two- and three-photon transitions in diatomic molecules , 1980 .

[5]  M. Roellig,et al.  Two‐photon excitation as a monitoring technique for photodissociation dynamics: CF3NO→CF3+NO(v,J) , 1980 .

[6]  J. O. Berg,et al.  Symmetry assignment of two‐photon states from polarization characteristics of multiphoton ionization spectra , 1978 .

[7]  H. Zacharias,et al.  Three-Photon Excitation of Xenon and Carbon Monoxide , 1977 .

[8]  C. Kittrell,et al.  Two photon excitation of the vacuum ultraviolet fluorescence of carbon monoxide , 1977 .

[9]  T. Hänsch,et al.  High resolution two‐photon spectroscopy in the 1B2u state of benzene , 1976 .

[10]  R. Hochstrasser,et al.  Two-photon absorption by rotating diatomic molecules , 1976 .

[11]  F. H. Read,et al.  Measured lifetimes of the two vibrational levels of the b3 Σ + state of CO , 1973 .

[12]  F. H. Read,et al.  Determination of the transition moment of the B1 Σ +-X1 Σ + transition in CO , 1972 .

[13]  J. D. Simmons,et al.  Atlas of the Observed Absorption Spectrum of Carbon Monoxide Between 1060 and 1900 Å , 1972 .

[14]  Richard Anderson,et al.  Radiative Lifetime of the B 1 ∑ + State of CO* , 1970 .

[15]  D. Robinson,et al.  Study of Some Electronic Transition Probabilities in CO and CN , 1968 .

[16]  J. Hesser.  Absolute transition probabilities in ultraviolet molecular spectra. , 1968 .

[17]  R. G. Fowler,et al.  Transition Probabilities for H2, D2, N2, N2+, and CO , 1966 .