Measurement of the rotational temperature in a nitrogen molecular beam by REMPI

H. Yamaguchi*, T. Moriyama, K. Ide, J. Ito, Y. Matsuda, T. Niimi

*この研究の対応する著者

研究成果: Conference contribution

抄録

Molecular beams have been used for diagnoses of solid surfaces and gas-surface interactions. For molecular beams of polyatomic gases, it is important to clarify the distribution over the energy states of the internal degree of freedom. In this study, the rotational energy distribution in a nitrogen molecular beam was spectroscopically measured by the (2+2)N 2-REMPI (Resonantly Enhanced Multiphoton Ionization) technique. REMPI is known to have very high detection sensitivity, which allows us to detect molecules under the very low number density condition like in a molecular beam. A REMPI spectrum indicates the rotational energy distribution of molecules, and is not affected by secondary electrons, which simplifies the analysis. The molecular beam was generated using a Kantrowitz-Grey type beam source. The measured REMPI spectra were well fitted by a theoretical spectrum with the Boltzmann distribution, and the rotational temperatures were obtained. Since the supersonic freejet was employed as a beam source, the rotational temperature in the molecular beam was analyzed in accordance with the frozen rotational temperature in a supersonic freejet using the parameter p0d, which is a product of the source pressure p0 and the orifice diameter d. It was found that the rotational temperature is well described as a function of the parameter p0d under the fixed source tempearture condition.

本文言語English
ホスト出版物のタイトル28th International Symposium on Rarefied Gas Dynamics 2012
ページ1350-1354
ページ数5
1
DOI
出版ステータスPublished - 2012 12月 1
外部発表はい
イベント28th International Symposium on Rarefied Gas Dynamics 2012, RGD 2012 - Zaragoza, Spain
継続期間: 2012 7月 92012 7月 13

出版物シリーズ

名前AIP Conference Proceedings
番号1
1501
ISSN(印刷版)0094-243X
ISSN(電子版)1551-7616

Other

Other28th International Symposium on Rarefied Gas Dynamics 2012, RGD 2012
国/地域Spain
CityZaragoza
Period12/7/912/7/13

ASJC Scopus subject areas

  • 物理学および天文学(全般)

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