Laser-induced fluorescence study of radiative lifetimes and quenching rates in CS A1Π(υ = 0)
✍ Scribed by Anthony J. Hynes; John H. Brophy
- Publisher
- Elsevier Science
- Year
- 1979
- Tongue
- English
- Weight
- 331 KB
- Volume
- 63
- Category
- Article
- ISSN
- 0009-2614
No coin nor oath required. For personal study only.
✦ Synopsis
Radiative lifetimes and quenching rates habe been measured for rotational levels of CS
A 'r~(v = 0) throughout the region of perturbation by the a' 3p -(u = 10) state. The measured lifetimes reflect the extent of mi..ing with the a' 3~ state and from the unperturbed value oft = 171 + 10 ns the oscilktor strength and transition moment of the CS A 'II--X '23(0,0) band are ctlcuIated to bef,o = l.G(=G.i) X IO-' and R, <r,-,o) = 0.32 -c 0.09 au. respecthely. I _ Introduction Narrow bandwidth tuneable dye lasers provide a selective and sensitive method of preparing and detecting excited molecular states. The ability to probe individual u,J levels has made laser-induced fluorescence particularly useful in molecular beam chemistry [ 11 and detailed radiative lifetime measurements [21_ In this paper we have used the technique to measure lifetimes and quenching rates in the A 1 II state of the CS molecule.
Perturbations in the optical spectrum of CS arise through interaction of the A 1 ll with several nei&bouring triplet states as in CO_ In CS however, the larger spin-orbit interaction and density of vibronic levels leads to more pronounced effects_ Analysis of the absorption spectrum shows that for A 1 lI(u = 0) the ma-