P101
Two-photon Laser Optogalvanic Spectroscopy of Rare Gases
Naveed Khaliq Piracha
NIMC
Optogalvanic effect (OGE) is a change in the electrical properties of a gaseous discharge when illuminated by radiation resonant with an atomic or molecular transition of the species present in the discharge. This is a very powerful and an inexpensive technique of spectral detection. The rare gases maintain a special significance in the optogalvanic effect studies. Single-colour two-photon laser optogalvanic studies of the Rydberg states of rare gases have been conducted using an excimer pumped dye laser in conjunction with a discharge cell. The experimental technique employed, enabled us to record pure two-photon Rydberg spectra and an extensive new data in regions dominated by one-photon transitions. In these spectra, the appearance of two-photon parity forbidden transitions is considered to be the result of Stark l-mixing. The interchannel interaction among the Rydberg series is studied using the multichannel quantum defect theory.
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