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Featured researches published by B. Fridovich.


Journal of Molecular Spectroscopy | 1982

Tunable diode laser spectroscopy of NO2 at 6.2 μm

V. Malathy Devi; B. Fridovich; G. D. Jones; D. G. S. Snyder; Palash P. Das; J.-M. Flaud; C. Camy-Peyret; K. Narahari Rao

Abstract High-resolution spectra in the ν 3 region of 14 N 16 O 2 were measured by using a diode laser as a source to a vacuum grating spectrometer. Spin-rotation constants for the ν 3 and ν 2 + ν 3 states were determined from the observed data. Absolute strengths and transition moments for the ν 3 and ν 2 + ν 3 − ν 2 bands were derived from the observed line strengths at 296 K. Self-broadened and N 2 -broadened half-widths were measured for several of the ν 3 band lines at room temperature. Temperature-dependent half-widths for two N 2 -broadened ν 3 lines are also reported.


Journal of Molecular Spectroscopy | 1984

Diode laser measurements of strengths, half-widths, and temperature dependence of half-widths for CO2 spectral lines near 4.2 μm

V. Malathy Devi; B. Fridovich; G. D. Jones; D. G. S. Snyder

Abstract Absolute line strengths have been measured at room temperature for spectral lines in the R branch of the ν3 band of 12C16O2, 12C16O18O, and 12C16O17O and the (ν2 + ν3) − ν2 and (ν1 + ν3) − ν1 bands of 12C16O2 in the region 2365–2393 cm−1 using a tunable diode laser spectrometer; from these measurements band strengths have been computed. Self- and nitrogen-broadened half-widths have been measured for some ν3 lines of 12C16O2 and 12C16O17O, and nitrogen-broadened half-widths measured for some (ν2 + ν3) − ν2 band lines of 12C16O2. From measurements made over a temperature range from 217 to 299 K we have obtained temperature coefficients n, for the N2-broadened Lorentz half-width defined as b L 0 (T) = b L 0 (T 0 )( T T 0 ) −n , for the ν3 and (ν2 + ν3) − ν2 bands of 12C16O2. They are 0.757 ± 0.008 and 0.789 ± 0.015, respectively.


Journal of Molecular Spectroscopy | 1983

Strengths and lorentz broadening coefficients for spectral lines in the ν3 and ν2 + ν4 bands of 12CH4 and 13CH4

V. Malathy Devi; B. Fridovich; G. D. Jones; D. G. S. Snyder

Abstract Line strengths and self- and nitrogen-broadened half-widths were measured for spectral lines in the ν3 and ν2 + ν4 bands of 12CH4 and 13CH4 from 2870–2883 cm−1 using a tunable diode laser spectrometer. From measurements made over a temperature range from 215 to 297 K, on samples of 12CH4 broadened with N2, we deduced that the average temperature coefficients n, defined as b L 0 (T) = b L 0 (T 0 )( T T 0 ) −n , of the Lorentz broadening coefficients for the ν3 and ν2 + ν4 bands of 12CH4 were 0.97 ± 0.03 and 0.89 ± 0.04, respectively. A smaller increase is observed in line half-width with increasing pressure for E-species lines, for both self- and nitrogen-broadening, than for other symmetry species lines over the range of pressures measured, 70 to 100 Torr.


Journal of Molecular Spectroscopy | 1984

Transition dipole matrix elements for 14NH3 from the line intensities of the 2ν2 and ν4 bands

Š. Urban; D. Papoušek; V. Malathy Devi; B. Fridovich; Romola D'Cunha; K. Narahari Rao

Line intensities as well as self- and nitrogen-broadening coefficients have been determined for 20 transitions in the 2ν2 and ν4 bands of 14NH3 using a diode laser spectrometer. Vibrational-inversional transition moments have been determined for transitions from the ground state to the ν2, 2ν2 and ν4 states by a least-squares fit to the line intensities, taking into account Coriolis and l-type interactions between the nν2 (n = 1, 2, 3), ν4 and ν2 + ν4 states [S. Urban, V. Spirko, D. Papousek, R. S. McDowell, N. G. Nereson, S. P. Belov, L. I. Gershtein, A. V. Maslovskij, A. F. Krupnov, J. Curtis, and K. Narahari Rao, J. Mol. Spectrosc. 79, 455–495 (1980)]. The values of these transition moments have been combined with the previously obtained transition moments for NH3 and its isotopomers to obtain an improved fit to the μz component of the electric dipole moment function of ammonia [cf. V. Spirko, J. Mol. Spectrosc. 74, 456–464 (1979)].


Journal of Molecular Spectroscopy | 1978

Absorption spectrum of carbon dioxide at 4.3 μm

A. Baldacci; V. Malathy Devi; Da-Wun Chen; K. Narahari Rao; B. Fridovich

Abstract The absorption spectrum of carbon dioxide has been recorded in the wavenumber region 2395-2216 cm −1 with a spectral resolution between 0.02 and 0.03 cm −1 . About twenty transitions have been identified and the molecular constants of the levels involved have been evaluated. In view of the interest of this region in atmospheric studies a map of the entire spectrum recorded by using a normal sample of carbon dioxide is presented including the identifications for the different bands. About 90% of the lines observed have been interpreted. Some of them have been assigned to transitions originating from higher excited states of 12 C 16 O 2 not considered before in interpreting this spectral region. For the first time, bands of 12 C 16 O 17 O have been identified in the 4.3-μm spectra obtained with the natural sample.


Journal of Molecular Spectroscopy | 1978

Interpretation of the 13C16O2 spectrum at 4.4 μm

A. Baldacci; Louise Linden; V. Malathy Devi; K. Narahari Rao; B. Fridovich

Abstract The overlapping structure observed in the region of the ν 3 fundamental of 13 C 16 O 2 at 4.4 μm has been assigned to several transitions belonging to not only the 13-C variety of carbon dioxide ( 13 C 16 O 2 ) but also to 13 C 16 O 17 O and 13 C 16 O 18 O species occurring in the sample. Molecular constants have been evaluated for the assigned transitions.


Journal of Quantitative Spectroscopy & Radiative Transfer | 1983

Tunable diode laser measurements of intensities and Lorentz broadening coefficients of lines in the ν2 band of 12CH4

V. Malathy Devi; B. Fridovich; D. G. S. Snyder; G. D. Jones; Palash P. Das

Abstract Absolute line strengths and self-, nitrogen-, and air-broadened half-widths, for five lines in the R -branch of the ν 2 fundamental of methane have been measured at room temperature using a tunable diode laser spectrometer.


Journal of Molecular Spectroscopy | 1980

Convolution of a Doppler line by a Gaussian instrument function

B. Fridovich; V. Malathy Devi; Palash P. Das

A simple and direct method is obtained for assessing the distortion of a Doppler line by a Gaussian instrument function. It is suggested that a close approximation to the width of a Gaussian instrument function, or an almost Gaussian function, may be obtained by measuring a line with a Doppler absorption coefficient. The method is applicable to diode laser measurements, and may be used whenever a Gaussian instrument function is a reasonable approximation to real conditions


Journal of Molecular Spectroscopy | 1985

Intensities and half-widths for several H2O ν2 lines in the region 1500–1523 cm−1

V. Malathy Devi; B. Fridovich; G. D. Jones; D. G. S. Snyder

Abstract Intensities and half-widths have been measured, using a tunable diode laser, for several water vapor lines in the ν 2 spectral region between 1500 and 1523 cm −1 . Where possible, results have been compared with previously published values.


Applied Optics | 1986

Tunable diode laser measurements of air-broadened linewidths in the ν 6 band of H 2 O 2

V. Malathy Devi; C. P. Rinsland; Mary Ann H. Smith; D. Chris Benner; B. Fridovich

Air-broadened halfwidths of eighteen transitions in the ν6 band of H2O2 have been determined at room temperature from high resolution laboratory spectra recorded with a tunable diode laser system. The measured transitions occur in the 1252–1291-cm−1 region. For these eighteen transitions, the measured halfwidths range from 0.0923 to 0.1155 cm−1 atm−1.

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D. G. S. Snyder

National Oceanic and Atmospheric Administration

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G. D. Jones

National Oceanic and Atmospheric Administration

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