Radiative lifetime and quenching constants of the PF(A3II) state

Jie Xu; D. Raybone; Donald W. Setser

doi:10.1117/12.145238

6 June 1993 Radiative lifetime and quenching constants of the PF(A³II) state

Jie Xu, D. Raybone, Donald W. Setser

Proceedings Volume 1871, Intense Laser Beams and Applications; (1993) https://doi.org/10.1117/12.145238
Event: OE/LASE'93: Optics, Electro-Optics, and Laser Applications in Scienceand Engineering, 1993, Los Angeles, CA, United States

Abstract

The radiative lifetime and the quenching rate constants of the PF(A³$PI_0,1,2) state have been measured using a microwave discharge to generate PF(X³(Sigma) ^-) in a flow reactor incorporating laser-induced fluorescence. A radiative lifetime of 4.2 +/- 0.2 microsecond(s) has been determined for a 300 K Boltzmann distribution of rotational and spin- orbit states of PF(A,v' equals 0). The two-body quenching rate constants for PF(A³$PI) by diatomic and polyatomic molecules and rare gases were determined at 300 K from the pressure dependence of the first-order decay constants. Electronic quenching by He, Ar, CF₄ and SF₆ is inefficient and upper limits to these deactivation rate constants are 2 - 4 X 10^-14 cm³ molecule^-1 s^-1. Except for highly fluorinated molecules, the quenching constants for most molecules are in the range of 0.05 - 4.0 X 10^-10 cm³ molecule^-1 s^-1. The available data suggest that the PF(A³$PI_0,1,2) state has some promise as a potential UV laser candidate, providing that an efficient excitation method can be discovered.

Citation Download Citation

Jie Xu, D. Raybone, and Donald W. Setser "Radiative lifetime and quenching constants of the PF(A³II) state", Proc. SPIE 1871, Intense Laser Beams and Applications, (6 June 1993); https://doi.org/10.1117/12.145238

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