XUV-laser spectroscopy on CO: isotope-selective predissociation rates

Pieternel F. Levelt; Wim Ubachs; Wim Hogervorst

doi:doi:10.1051/jp2:1992167

Issue		J. Phys. II France Volume 2, Number 4, April 1992


Page(s)		801 - 812
DOI		https://doi.org/10.1051/jp2:1992167

DOI: 10.1051/jp2:1992167
J. Phys. II France 2 (1992) 801-812

XUV-laser spectroscopy on CO: isotope-selective predissociation rates

Pieternel F. Levelt, Wim Ubachs and Wim Hogervorst

Laser Centre Free University, Department of Physics and Astronomy, De Boelelaan 1081, 1081 HV Amsterdam, The Netherlands

(Received 5 November 1991, accepted 18 December 1991)

Abstract
The K (4p $\sigma$ ) $^1\sum ^+$ , v=0 and W (3s $\sigma$ ) $^1\Pi$ , v=2 states in ¹²C ¹⁶O and ¹³C ¹⁶O have been studied in high resolution with extreme ultraviolet laser radiation in the wavelength range 94-97 nm. Accurate spectroscopic constants for both isotopes and states have been derived from absolute rotational line positions. From linewidths of individual rotational transitions predissociation rates for ¹²C ¹⁶ and ¹³C ¹⁶O in the W $^1\Pi\,\, v=2$ state have been deduced: $k_{\rm p} \,(^{12}$ CO) $\,\,= 1.15 \,(15) \times 10^{11}$ s ^-1 and $k_{\rm p}\, (^{13}$ CO) $\,\, = 0.58 \,(13) \times 10^{11}$ s ^-1. The rate of photodissociation of K $^1\sum ^+$ , v=0 was found to be smaller: $k_{\rm p} = 2.6\, (1.3) \times 10^{10}$ s ^-1 for both isotopes.