Francis S. Bonomo

Statistical Band Model Parameters and Integrated Intensities for the 5.9-μ, 7.5-μ, and 11.3-μ, Bands of HNO 3 Vapor

Quantitative absorption measurements of the 5.9-mu, 7.5-mu, and the 11.3-mu bands of pure HNO(3) vapor were carried out at 40 degrees C. Use was made of absorption cells of various lengths in order to obtain curves of growth. The statistical spectral band model was applied, and band model parameters and integrated intensities were derived.

Nitric-acid band intensities and band-model parameters from 610 to 1760 cm −1

A set of 59 spectra of pure nitric acid was obtained at temperatures ranging from 236 to 294 K using path lengths from 10 to 50 cm and pressures from 0.05 to 1.1 Torr. No strong temperature dependencies were observed over the range of our measurements. Absorption coefficients and mean line-spacing parameters were determined at each 1-cm−1 interval in the three strong bands at 5.9, 7.5, and 1.3 μm by using a two-parameter random-band model. The resulting intensities for these bands are 1530 ± 100, 1383 ± 70, and 692 ± 35 cm−2 amagat−1, respectively. In addition, the absorption coefficients were determined in the three weak bands at 8.3, 13.2, and 15.5 μm. The band intensities derived are 44 ± 4, 45 ± 4, and 50 ± 5 cm−2 amagat−1, respectively.

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.

Temperature dependence of HNO 3 absorption in the 11.3-μm region

Laboratory spectra have been obtained for HNO3 with a Michelson-type Fourier transform interferometer using absorption cells with path lengths of 10.3, 25.5, and 49.8 cm at temperatures of 240, 248, 283, and 294 K. The measurements lead to a total band intensity value of 642 plus or minus 5% per sq cm amagat, which is a temperature independent value after the gas density correction has been made. However, the temperature dependence of the spectral absorption coefficients is apparent in the 885 kayser region.

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 .

Spectroscopic line parameters for the nu6 band of carbonyl fluoride

New measurements and analysis of high resolution(0.0025 cm(-1)) laboratory spectra of the carbonyl fluoride v6 band are described. The data are used to generate line parameters suitable for high resolution atmospheric studies.

Absolute integrated intensity and individual line parameters for the 6·2μ band of NO2

Abstract The absolute integrated intensity of the 6·2μ band of NO 2 at 40°C was determined from quantitative spectra at ~ 10 cm −1 resolution by the spectral band model technique. A value of 1430±300 cm −2 atm −1 was obtained. Individual line parameters, positions, intensities and ground state energies were derived, and line-by-line calculations were compared with the band model results and with the quantitative spectra obtained at ~ 0·5 cm −1 resolution.

Intensity of the hydrogen peroxide υ 6 (b) band around 1266 cm −1

Laboratory spectra of the upsilon(6)(b) band of H(2)O(2) at 1266 cm(-1) have been obtained at a resolution of 0.06 cm(-1) and at temperatures ranging from 278 to 294 K. A total band intensity of 375 +/- 17 cm(-2) amagat(-1) is determined from the spectra. Special techniques to handle the H(2)O(2) samples in a way that minimizes abundance determination errors are discussed.

Statistical-band-model analysis and integrated intensity for the 21.8 μm bands of HNO 3 vapor*

The 21.8 μm absorption bands of HNO3 vapor were measured at 40°C. Statistical-band-model analysis of the data resulted in spectral-band-model parameters and yielded an integrated intensity of 393 ± 15% (cm−2 atm−1) at 40°C between 390 and 502 cm−1.

The ν4 band of carbonyl fluoride

Abstract Using 0.0025-cm−1 resolution Fourier transform laboratory spectra, a thorough analysis of the ν4 band of COF2 has been performed leading to an extensive (up to J = 77 and Ka = 46) and precise (±0.0002 cm−1) set of energy levels for the v4 = 1 vibrational state of this molecule. It proved not possible to reproduce these experimental levels when considering the v4 = 1 vibrational state as isolated, and it has been necessary to take into account the Coriolis-type resonance between the levels of this state and those of a nearby state located about 4 cm−1 below. In this way, an accurate band center (ν0(ν4) = 1243.26609 ± 0.00014 cm−1) and rotational and coupling constants were derived. These constants were then used to generate a comprehensive list of line parameters suitable for high-resolution atmospheric studies.