LASER-INDUCED FLUORESCENCE FROM THE $A^{2}\Delta, B^{2}\Pi, C^{2}\Sigma^{+}$ AND $G^{2}\Sigma^{-}$ STATES OF THE NS $RADICAL^{\ast}$

Jeffries, Jay B.; Smith, Gregory P.; Crosley, David R.

LASER-INDUCED FLUORESCENCE FROM THE $A^{2}\Delta, B^{2}\Pi, C^{2}\Sigma^{+}$ AND $G^{2}\Sigma^{-}$ STATES OF THE NS $RADICAL^{\ast}$

Files

1984-FB-06.jpg (1.3 MB)

Date

1984

Authors

Jeffries, Jay B.

Smith, Gregory P.

Crosley, David R.

Publisher

Ohio State University

Abstract

Laser-induced fluorescence has been observed from transitions between $A 2 Δ, B 2 Π, C 2 Σ +$ , and $G 2 Σ −$ and the $X 2 Π$ ground state of the NS molecule. NS was monitored in a flow reactor downstream from a low pressure microwave discharge in $S F 6$ and $N 2$ . Laser radiation tunable from 2.8.8-336.0 nm with bandwidth $0.3 c m −1$ was produced by Raman shifting a frequency doubled dye Laser. Rotationally resolved fluorescence excitation spectra of $A 2 Δ . v ′=0−1; B 2 Π, v ′=0−12$ ; and $C 2 Σ +, v' =0$ been observed. Relative band emission strengths for 12 bands of $A 2 Δ,232$ bands of $B 2 Π$ and 6 bands of $C 2 Σ +$ have been measured and Franck-Condon overlap factors determined. Preliminary observations indicate collision-induced transitions occur between fine structure levels of $B 2 Π$ . Rapid collisional quenching of $B 2 Π, v' =12$ and $A 2 Δ v' =0$ (but not $A 2 Δ v' =1$ or $B 2 Π v' =1−11$ ) suggests collisional mixing with predissociative levels. Lifetime measurements for $B 2 Π$ and the observed collisional quenching of $B 2 Π, v' =12$ are in agreement with the recent results of Matsumi $e t a t . 1$

Description

$*$ Supported by the National Science Foundation, Grant No. CPE-80-17521. $1$ Y. Matsumi, T. Munakata, and T. Kasuya, J. Phys. Chem. 88, 264 (1984).

Author Institution: Chemical Physics Laboratory, SRI International

URI

http://hdl.handle.net/1811/16584

Collections

Abstracts of OSU International Symposium on Molecular Spectroscopy 1980-1989

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