Gain Measurements in CO2 Isotope Lasers

Silver, M.; Hartwick, T. S.; Posakony, M. J.

doi:10.1063/1.1658497

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1992

1997

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Cited by 22 publications

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“…The optogalvanic proportionality constant can be assumed to be independent of isotope or to modify slightly the effective laser interaction cross section ratio cr13/ar12. The theoretical value for cr13/u12 can be calculated (18) and is 1.67, thus favoring detection of the rarer isotope. In practice, to achieve the accuracy required, one must determine u13/u12 experimentally using a calibrated gas mixture.…”

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confidence: 98%

Laser-Based Analysis of Carbon Isotope Ratios

Murnick

Peer

1994

Science

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A laser technique for analysis of carbon-13:carbon-12 ratios with the specificity of laser resonance spectroscopy and the sensitivity and accuracy typical of isotope ratio mass spectrometers is reported. The technique is based on laser optogalvanic effect spectroscopy, in which an electrical (galvanic) signal is detected in response to the optical stimulation of a resonance transition in a gas discharge species. Carbon dioxide molecular gas lasers are used, with the probed transitions being identical to the lasing transitions. Measurements for carbon dioxide samples with 100-second averaging times yield isotopic ratios with a precision of better than 10 parts per million.

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confidence: 98%