Temporal evolution and variation of laser optogalvanic signals in the spectra of inert gases

✍ Scribed by Shaukat Mahmood; M. Anwar-ul-Haq; M. Riaz; M.A. Baig

• Publisher: Elsevier Science
• Year: 2004
• Tongue: English
• Weight: 245 KB
• Volume: 236
• Category: Article
• ISSN: 0030-4018
• DOI: 10.1016/j.optcom.2004.03.057

✦ Synopsis

We present new studies on the temporal evolution and variation of the laser optogalvanic signals in the spectra of inert gases using commercial hollow cathode lamps in conjunction with a Nd:YAG pumped dye laser system. The behavior of the optogalvanic signals for the transitions following the DJ ¼ DK ¼ 0 and AE 1 dipole selection rules in the j c K-coupling scheme namely mp

3, 4 and 5 for neon, argon, krypton and xenon, respectively) metastable level have been investigated. An empirical relation is formulated: SðtÞ ¼ S min þ AðtÞ expðÀa½I À I 0 Þ which satisfactorily describes the shift of the optogalvanic signal and the change in the population of the upper level as a function of the discharge current. It is observed that the shift in the optogalvanic signal peaks for the DJ ¼ DK ¼ À1 transitions is larger than that for the DJ ¼ DK ¼ þ1 transitions whereas the signal peaks remain unshifted for the DJ ¼ DK ¼ 0 transitions.