The rotation-inversion spectrum of ammonia

Dowling, Jerome M.

doi:10.1016/0022-2852(68)90058-1

Cited by 43 publications

(12 citation statements)

References 15 publications

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“…is the rotational constant of the vibrational ground state; D J and D J K are the respective centrifugal stretching constants [71]. K is an average value of the quantum number K accounting for all K transitions with the same quantum number J .…”

Section: Rotation-inversion Transitions In Ammonia Vaporsmentioning

confidence: 99%

Nonlinear propagation of terahertz pulses in ammonia vapor

et al. 2014

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International audienceWe consider the propagation of terahertz (THz) pulses resonant with the lowest rotational levels in ammonia vapors at room temperature. We demonstrate a quasisimultonic regime of propagation for two-color THz pulses (their lossless simultaneous propagation with equal group velocities and stable envelopes at finite distances, like coupled solitons). The quasisimultons are formed by two pulses synchronized in time, the first one being intense and two humped with an area multiple of 4π , while the another one is weaker, one humped, and with an area much less than π. Two-and one-humped pulses have equal width and copropagate in ammonia vapor at the same group velocity. Moreover, the larger the dip of the two-hump pulse is, the weaker may be the one-humped pulse. The stability of this coupled state is provided by the fact that the two-humped pulse makes the medium transparent for the one-humped pulse. In its turn, the latter prevents the breakup of the former into separate pulses. It is established as well that a multihumped pulse with an odd or even number of humps and a hyperbolic secant pulse can behave like a simulton. In this case, the area of multihumped pulse equals to 2nπ , where n is the number of humps in the powerful pulse structure

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Section: Rotation-inversion Transitions In Ammonia Vaporsmentioning

confidence: 99%

Nonlinear propagation of terahertz pulses in ammonia vapor

et al. 2014

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“…Given this, we have recalculated the halfwidths and temperature exponents for N2, 02, and C02 broadening of C02 by explicitly using equation (16).…”

Section: (7mentioning

confidence: 99%

Calculations and Databasing of Molecular Absorption Parameters for HITRAN

Gamache¹

1991

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“…L'interprétation a été faite en trois étapes : 1) utilisant les résultats de travaux antérieurs [1], [2] sur le spectre de rotation-inversion et le spectre d'inversion pure de la molécule d'ammoniac, nous avons d'abord calculé les niveaux rotationnels de l'état fondamental de vibration ;…”

Section: Interprétation Du Spectre De Vibration-rotationunclassified

“…-3.1 DÉTERMINA-TION DES NIVEAUX ROTATIONNELS DE L'ÉTAT FONDA-MENTAL. -Les niveaux de rotation de l'état fondamental ont été calculés à partir de l'étude du spectre de rotation-inversion effectuée avec une grande précision par Dowling [1]. Leurs énergies sont données par la formule suivante, qui fait intervenir des termes provenant du développement de l'hamiltonien jusqu'au quatrième ordre d'approximation :…”

Section: Interprétation Du Spectre De Vibration-rotationunclassified