Laser optogalvanic spectroscopy of argon in the wavelength region 605–740 nm |
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| Authors: | R C Sharma T Kundu S N Thakur |
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| Institution: | (1) Laser Spectroscopy Laboratory, Physics Department, Banaras Hindu University, 221 005 Varanasi, India;(2) Department of Physics, Indian Institute of Technology, 400 076 Mumbai, India |
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| Abstract: | Two-photon optogalvanic transitions in Ar glow discharge with Nd: YAG laser pumped dye laser excitation in the frequency range
13520–16520 cm−1 has been studied using linear and circular polarization. The intensities of two-photon optogalvanic transitions are very
sensitive to changes in the incident laser power which is not the case with one-photon transitions. Intensity ratio for circular
and linear polarized light for two photon transitions 6s′1/2]°1←4s3/2]°2, 6s′1/2]°0←4s3/2]°2, and 5d1/2]°0←4s3/2]°2, 5d1/2]°1←4s3/2]°2 are quite different from the other two-photon transitions. This has been explained as due to near one photon resonance
of 4p′3/2]1 level for the first pair and 4p′1/2]1 for the second pair of transitions. The ratio of optogalvanic intensity for circular to linear polarized light has
been theoretically estimated and compared with the observed results. |
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| Keywords: | Optogalvanic spectrum two-photon transitions laser spectroscopy |
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