Abstract

A cooled hollow-cathode cell was used for observation of the infrared spectra of positive ions in the 3-μm region with a difference-frequency laser as a radiation source. About an order-of-magnitude enhancement of the signal intensity was attained, compared with the similar signals obtained with our previous glow-discharge cell. Ten more weaker lines of the ν₁ fundamental band of H₂D⁺, which could not be observed in our previous experiment [ J. Chem. Phys. 81, 2869 ( 1984)] were measured. Improved molecular constants were obtained from a least-squares fit including the infrared lines and the two millimeter- and submillimeter-wave lines in the ground state.

© 1985 Optical Society of America

Observation of the ν₂ (bending) fundamental of the HN₂⁺ ion at 14.6 micrometers

Trevor J. Sears
J. Opt. Soc. Am. B 2(5) 786-789 (1985)

Infrared laser spectroscopy of H₃O⁺ between 510 and 1150 cm⁻¹

P. B. Davies, P. A. Hamilton, and S. A. Johnson
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Accurate absolute reference frequencies from 1511 to 1545 nm of the ν1+ν3 band of ¹²C2H2 determined with laser frequency comb interval measurements

Alan A. Madej, A. John Alcock, Andrzej Czajkowski, John E. Bernard, and Sergei Chepurov
J. Opt. Soc. Am. B 23(10) 2200-2208 (2006)

Accurate absolute frequencies of the ν₁+ν₃ band of ¹³C₂H₂ determined using an infrared mode-locked Cr:YAG laser frequency comb

Alan A. Madej, John E. Bernard, A. John Alcock, Andrzej Czajkowski, and Sergei Chepurov
J. Opt. Soc. Am. B 23(4) 741-749 (2006)

Hyperfine structure in excited vibrational states of NH₃ studied by laser-Stark spectroscopy

W. H. Weber
J. Opt. Soc. Am. B 2(5) 829-836 (1985)