Stark spectroscopy with the CO laser: The dipole moment of H2CO in the v2=2 state
- 15 August 1975
- journal article
- research article
- Published by AIP Publishing in The Journal of Chemical Physics
- Vol. 63 (4), 1682-1685
- https://doi.org/10.1063/1.431497
Abstract
Some transitions of the 2ν2←ν2 hot band of H2CO near 5.8 μm have been observed by the laser Stark technique using a 20 cm long intracavity absorption cell with about 4 mtorr total pressure at room temperature. The detection of this weak hot band (partial pressure in the v2=1 state ?8×10−7 torr) illustrates the high sensitivity of intracavity laser absorption spectroscipy. From the measured resonant fields of the transitions, the dipole moment of H2CO in the v2=2 state has been determined. The use of phase sensitive detection at twice the Stark modulation frequency is illustrated; this 2f detection effectively measures the strength of the transient nutation signal in the absorbing gas, and in some cases results in a better signal to noise ratio than does conventional 1f detection.Keywords
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