A laser-induced fluorescence study of energy transfer between the symmetric stretching and bending modes of CO2

✍ Scribed by R.K. Huddleston; Eric Weitz

• Publisher: Elsevier Science
• Year: 1981
• Tongue: English
• Weight: 675 KB
• Volume: 83
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(81)80314-4

✦ Synopsis

The equilibration of the lower laser levers in COz, loo0 and 02O0, has been studied via a laser-induced fluorescence technique. We conclude that the coupling between these leveis is rapid, >llOO ms-' To& I and that these levels are also coupted though at a somewhat slower rate of 387 f 75 ms-* Torr-' to the bending modes of C&.

1. IntYoduction

Vibrational energy transfer in gaseous CO, has been extensively studied [l-26]. While CO2 has come lo be regarded as a model compound for energy transfer studies, a number of vibration-vibration energy transfer rates in this system remain in dispute. The refaxation of the 001 state appears to be well established at a rate of 0.33 + 0.005 ms-l Torr-t [4-71 and a number of resonant vibration-vibration energy transfer rates have recently been measured 1263. However, the rates for the process coupling 02OO and 1 O"O, the lower levels, CO,{ 1000) f C0,(0000) kb 2 c02(0200) + C0,(0000), AE= 103 cm-l , (0 ,hich due to Fermi mixing are a nearly equal mixture I &he unperturbed 02OO and I O"O states and the prozss coupling the fund~ental of the bend to the fower I?':r levels and the 0220 state remain in question. Tf' %zr process may either proceed directljr via C fizt_ iO"O or 02OO) + C02(OO"O)