Quantum-state-specific metastable time-of-flight as a probe of CO photodesorption from GaAs(100)
✍ Scribed by Matt Nooney; J.M. Price; R.M. Martin; A.M. Wodtke
- Publisher
- Elsevier Science
- Year
- 1995
- Tongue
- English
- Weight
- 637 KB
- Volume
- 245
- Category
- Article
- ISSN
- 0009-2614
No coin nor oath required. For personal study only.
✦ Synopsis
By exciting the 'forbidden' a31-I ~ X ~E+ bands of CO with an intense ultraviolet laser pulse, neutral time-of-flight (TOF) distributions of single quantum states of CO can be obtained using long (> 10 cm) flight paths. This new method is applied here to surface photodesorption in order to simultaneously determine the rotational, vibrational and translational energy content of CO formed in the reaction CO/GaAs(100) + h~,(248 nm) ~ CO(X IE+, c -4< 4, J-4< 24) + GaAs(100). Distinctly non-Boltzmann translational energy distributions were obtained for every observed quantum state of CO. Other state specific observations are discussed.