- 作者: Castano, J. ; Zapata, V. ; Makarov, G. et al.
- 作者服務機構: Unidad de Laseres y Haces Moleculares, Instituto Pluridisciplinar, Universidad Complutense de Madrid, Madrid, Spain
- 中文摘要: A TEA CO/sub 2/-laser induced SF/sub 6/+Ba beam- surface ionization process has been studied when vibrational excitation of SF/sub 6/ molecules was carried out at (and near) the polished surface of the electrically heated up to 675K polycristalline Ba. Electron emission and negative molecular ion signal were detected. The dependence of the molecular ion signal on laser fluence and frequency(on SF/sub 6/ molecular absorption) as well as on the SF/sub 6/ gas pressure in the nozzle were studied. The results reveal a nonlinear, probably multiphoton character of the molecular ion formation and a clear vibrational selectivity, i.e. vibrational enhancement, of the SF/sub 6/+Ba beam-surface ionization process. Possible mechanisms of the negative molecular ion formation in the IR laser induced SF/sub 6/+Ba beam-surface ionization process are discussed.
- 英文摘要: --
- 中文關鍵字: Surface Ionization; Vibrational Excitation; Sulfur Fluoride; Pressure; Mechanism
- 英文關鍵字: 表面離子化;振動激發;氟化硫;壓力;反應機構