James R. Gillis

AFGL atmospheric absorption line parameters compilation - 1982 edition

The latest edition of the AFGL atmospheric absorption line parameters compilation for the seven most active infrared terrestrial absorbers is described. Major modifications to the atlas for this edition include updating of water-vapor parameters from 0 to 4300 cm(-1), improvements to line positions for carbon dioxide, substantial modifications to the ozone bands in the middle to far infrared, and improvements to the 7- and 2.3-microm bands of methane. The atlas now contains approximately 181,000 rotation and vibration-rotation transitions between 0 and 17,900 cm(-1). The sources of the absorption parameters are summarized.

AFGL trace gas compilation: 1982 version

The new edition of the AFGL trace gas compilation is described. The latest version provides the necessary parameters for the computation of absorption or emission spectra of major bands of twenty-one gases in the region from 0 to 10,000 cm−1. Emphasis on this edition has been on the addition of numerous millimeter and submillimeter transitions, the inclusion of bands of significance in upper atmospheric processes, and strong IR bands of trace constituents likely to be used for remote detection. The sources for the additions and modifications of the absorption parameters are summarized.

Spectral line parameters for the A2∑-X2Π(0,0) band of OH for atmospheric and high temperatures

Abstract Individual spectral line parameters including line positions, strengths, and intensities, have been generated for the A 2 ∑- X 2 Π(0,0) band of OH, applicable to atmospheric and high temperatures. Energy levels and transition frequencies are calculated by numerically diagonalizing the Hamiltonian. Line strengths are calculated using the dipole matrix and eigenvectors derived from energy matrix diagonalization. The line strengths are compared to those calculated from previously published algebraic line strength formulas. Tables of line parameters are presented for 240 and 4600°K.

Spectral line parameters for the X2II-X2II (1,0) bands of OH and ClO for atmospheric applications

Abstract Individual spectral line parameters, including line positions, energy levels, and intensities, have been generated for the X2II-X2II(1, 0) bands of OH and 35ClO and 37ClO for a temperature of 296 K. At this temperature the OH band intensity is 42.9 cm-1/atm-cm or 1.73 x 10-18 cm/molecule. For ClO, the band intensity for both isotopes in natural abundance is 11.8 cm-1/atm-cm or 4.76 x 10-19 cm/molecule. Tables of line parameters for both molecules are available from the authors.

Analysis of ν2 of H233S and H234S

Abstract We have extended our analysis of the (010) vibrational state of H 2 S, this time using Watsons A -reduced Hamiltonian (through P 8 terms) in the I ′ rotational representation. We have determined separate sets of (010) upper state constants for each isotopomer (H 2 32 S, H 2 33 S, and H 2 34 S) by fitting the ν 2 spectral lines, keeping the ground state constants fixed to the values determined by Flaud, Camy-Peyret, and Johns. Determinable coefficients for H 2 32 S and a slightly revised set of ν 2 line assignments for H 2 33 S and H 2 34 S are also reported.

Analysis of the ν2 and 2ν2-ν2 ozone bands from high-resolution infrared atmospheric spectra

Abstract High-resolution (0.02 cm −1 ) infrared atmospheric spectra were used for a new analysis of the ν 2 and 2 ν 2 - ν 2 bands of ozone and for generating a new line parameters compilation. Samples of the spectra and the analysed lines are presented.

Analysis of ν2 of H2Se

Abstract The infrared absorption band assigned to the bending mode v 2 of H 2 Te has been obtained under high resolution (≈0.10 cm −1 ) and analyzed as a Type B band of a planar asymmetric molecule. The molecular constants obtained are: (in cm −1 ) for the ground state A = 6.248 6 , B = 6.097 0 , C = 3.036 1 , τ aaaa = −0.002 5 , τ bbbb = −0.003 2 , τ aabb = 0.0021 9 and τ abab = −0.0005 5 ; and for the upper state v 0 = 860.79, A = 6.430 6 , B = 6.225 8 , C = 3.006 4 , τ aaaa = −0.003 4 , τ bbbb = −0.002 9 , τ aabb = 0.0025 7 , and τ abab = −0.0008 8 .

Stratospheric HNO3 quantification from line-by-line nonlinear least-squares analysis of high-resolution balloon-borne solar absorption spectra in the 870-cm-1 region.

Line parameters for the nu(5) and 2nu(9) bands and associated hot bands of HNO3 have been calculated and compared with laboratory spectra, and the results are presented. Spectral intervals near 870/cm for which best agreement was obtained are used to quantitatively analyze HNO3 absorption features in 0.02/cm resolution stratospheric solar absorption spectra.

Analysis of the ν1 + ν2 + ν3 band of O3

The high resolution spectrum of the ν1 + ν2 + ν3 band of O3 in the 2800-cm−1 region has been analyzed using Watsons Hamiltonian. The resulting Hamiltonian constants and previously published line intensities have been used to generate a listing of line assignments, positions, absolute intensities, and ground state energies. These should be useful for atmospheric studies.

Spectral line parameters for the pure rotation bands of solar OH

Abstract Spectral line parameters for the Δ v = 0 rotations transitions of OH observable in the solar photosphere are generated. The line parameters, which include line positions, gound state energies and intensities, are calculated at 6000 K for the X 2 Π(0-0), (1-1),(2-2), and (3-3) bands.