Vibrational and Rotational Energy Distributions in a Hot Cl2 Molecular Beam
- 1 July 1989
- journal article
- Published by IOP Publishing in Japanese Journal of Applied Physics
- Vol. 28 (7R)
- https://doi.org/10.1143/jjap.28.1268
Abstract
Vibrational and rotational energy distributions of a hot Cl2 (Cl2 *) molecular beam, which is used for a semiconductor device etching process, is studied by a laser-induced fluorescence method. The Cl2 * beam is produced by free jet expansion of a Cl2 gas heated in a quartz furnace. It is found that the hot molecular beam is a transition flow between a continuum free jet and an effusive flow. The vibrational and rotational energy distributions can be described by Boltzmann functions of well-defined temperatures. The vibrational temperature is rather close to the furnace exit temperature, while the rotational temperature is cooled to 150–250 K during the isentropic free expansion. These results show that furnace exit temperature is crucial to the production of a highly reactive hot molecular beam of large vibrational energy.Keywords
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