A near infrared line list for \NH: Analysis of a Kitt Peak spectrum after 35 years

A Fourier Transform (FT) absorption spectrum of room temperature NH3 in the region 7400 - 8600 cm-1 is analysed using a variational line list and ground state energies determined using the MARVEL procedure. The spectrum was measured by Dr Catherine de Bergh in 1980 and is available from the Kitt Peak data center. The centers and intensities of 8468 ammonia lines were retrieved using a multiline fitting procedure. 2474 lines are assigned to 21 bands providing 1692 experimental energies in the range 7000 - 9000 cm-1. The spectrum was assigned by the joint use of the BYTe variational line list and combination differences. The assignments and experimental energies presented in this work are the first for ammonia in the region 7400 - 8600 cm-1, considerably extending the range of known vibrational-excited statesComment: 27 pages, 6 table, 5 figures. Accepted for publication in Journal of Molecular Spectroscop

The absorption spectrum of water between 13 540 and 14 070 cm -1: ICLAS detection of weak lines and a complete line list

International audienceThe absorption spectrum of water vapor has been investigated by Intracavity Laser Absorption Spectroscopy (ICLAS) between 13 540 and 14 070 cm -1. This spectrum is dominated by relatively strong transitions of the 4 δ polyad of vibrational states. The achieved sensitivity - on the order of α min ˜ 10 -9 cm -1 - has allowed one to newly measure 222 very weak transitions with intensities down to 5 × 10 -28 cm/molecule at 296 K. Fifty new or corrected H 216O energy levels belonging to a total of 13 vibrational states could be determined from the rovibrational analysis based on variational calculations by Schwenke and Partridge. The previous investigations in the region by Fourier Transform Spectroscopy were critically evaluated and used to construct the best to date set of energy levels accessed by transitions in the considered region. All the rovibrational transitions reaching these upper energy levels and having intensities larger than 4.0 × 10 -28 cm/mol were calculated. In the resulting line list, the positions at the level of experimental accuracy were augmented with variational intensities leading to the most complete line list for water in normal isotopic abundance in the 13 500-14 100 cm -1 region

New assignments and a rare peculiarity in the high sensitivity CRDS spectrum of acetylene near 8000cm−1

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An empirical line list for methane near 1µm (9028–10,435cm−1)

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The absorption spectrum of water was recorded by ICLAS between 13540 and 14070 cm-1.

International audienceThe absorption spectrum of water vapor has been investigated by Intracavity Laser Spectroscopy (ICLAS) between 13540 and 14070 cm-1. This spectrum is dominated by relatively strong transitions of the 4 polyad of vibrational states. The achieved sensitivity – on the order of min~10-9 cm-1 – has allowed one to newly measure 222 very weak transitions with intensities down to 5×10-28 cm/molecule at 296 K. 50 new or corrected H2 16O energy levels belonging to a total of 13 vibrational states could be determined from the rovibrational analysis based on variational calculations by Schwenke and Partridge. The previous investigations in the region by Fourier Transform Spectroscopy were critically evaluated and used to construct the best to date set of energy levels accessed by transitions in the considered region. All the rovibrational transitions reaching these upper energy levels and having intensities larger than 4.0×10-28 cm/mol were calculated. In the resulting line list, the positions at the level of experimental accuracy were augmented with variational intensities leading to the most complete line list for water in normal isotopic abundance in the 13500-14100 cm-1 region

Line intensity measurements for acetylene between 8980 and 9420 cm –1

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Intracavity Laser Absorption Spectroscopy of D2O between 12850 and 13380cm−1

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The ν1 + 3ν3 absorption band of nitrogen dioxide (14N16O2) by CRDS near 6000 cm−1

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The absorption spectrum of ammonia between 5650 and 6350 cm−1

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