Absorption cross sections and V-T relaxation rates in SF6—Ar mixtures by time-resolved infrared multiphoton absorption

Lenzi, M.; Molinari, E.; Piciacchia, G.; Sessa, V.; Terranova, Maria Letizia

doi:10.1016/0301-0104(86)87017-3

Cited by 18 publications

(4 citation statements)

References 30 publications

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“…Now we increase the partial pressure of SF 6 from 0.002 to 0.13 Torr. The transferred energy of −12.4 cm −1 corresponds to n V = 9, which agrees with the experimental value of −14 cm −1 [12]. When comparing various results for ∆E , it is important to bear in mind that the gas mixture composition may have a substantial effect on results.…”

Section: Resultssupporting

confidence: 85%

“…Collision frequencies are determined using the model of hard spheres [32].The mean collision numbers are Z ab V = 2250, Z aa V = 108, and P 10 01 ≈ 1 [23,24]. In all the calculations, we have employed the temporal profile of the CO 2 laser pulse shown in figure 1 (the working mixture is similar to that in [12]). The laser frequency is 944 cm −1 .…”

Section: Resultsmentioning

confidence: 99%

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An exactly solvable model for multiphoton excitation of polyatomic molecules in the presence of collisions

Strekalov¹

2013

J. Stat. Mech.

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A theoretical study has been made on the non-stationary phenomena in the relaxation of highly vibrationally excited molecules under laser radiation giving rise to these molecules. An exact analytical solution to the master equation has been obtained in terms of Meixner polynomials with regard to VV and VT processes. The time-dependent vibrational distribution is used to obtain analytical expressions for the mean number of photons, stored on the vibrational degrees of freedom and transferred to a thermal bath. Using the latter result, an explicit expression is given for the average energy transfer as a function of time. Its dependence on the partial pressure of absorbing molecules has also been established.

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Section: Resultssupporting

confidence: 85%

Section: Resultsmentioning

confidence: 99%

An exactly solvable model for multiphoton excitation of polyatomic molecules in the presence of collisions

Strekalov¹

2013

J. Stat. Mech.

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“…High values of σ, in linear and nonlinear regime of absorption [9][10][11][12][13][14], show its ability for easy radiation field -molecule interaction (especially infrared (IR) radiation field). Values of τ rot in the range of (1-2)×10 -7 s [23][24][25][26][27][28][29][30] show its ability to reach proper ro-vibrational state due to mutual collisions with its gas partners, enhancing the absorption ability more than 50 %. Values of τ V-T in the range of (2-5)×10 -6 s [19][20][21][22] show its ability to transfer absorbed energy from its vibrational to translational modes of its collisional partners efficiently.…”

Section: Physical Characteristics Of Sf 6 Moleculementioning

confidence: 99%

Global warming and SF6 molecule

Gajević¹,

Stevic²,

Nikolić

et al. 2006

Facta Univ Phys Chem Technol

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In this paper the basic SF6 molecule physical characteristics are given concerning its influence on global warming and green house effect. Absorption and relaxation characteristics of this molecule have been investigated within the frame of nonlinear molecule – strong laser field interaction in different gas mixtures. All experiments have been performed on a different gas mixture pressures to analyze and investigate relaxation and energy transfer characteristics of absorbing molecules and non-absorbing collision partners. To show the SF6 absorption and relaxation and energy transfer capability comparison between SF6 and C2H4 was given using the same experimental conditions and argon as a buffer gas. All measurement points and their calculated values presented in this paper have been obtained using the infrared-pulsed photoacoustics technique adopted for atmospheric and subatmospheric pressures

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“…For one of the most intensively studied molecules, namely SF6, has been found (Lenzi et al 1986;Braun et al 1987;Beck and Gordon 1988) a linear dependence of (AE) on (E) for high excitation energies, and stronger than linear (3/2 power index) for values of (E) which correspond to the sparse region of vibrational levels. However it should be pointed out that Braun et al (1988) and Steinfeld et al (1970) found a linear dependence also for very low excitation energies (up to 1000cm-').…”

Section: Introductionmentioning

confidence: 99%