Evidence for double incoherent Raman scattering in binary gas mixtures:SF6−N2

Evidence for an isotropic signature in double vibrational collision-induced Raman scattering: A point-polarizable molecule model

“…Le Duff's study, among other findings, revealed that DRS is almost fully depolarized, giving rise solely to anisotropic spectra [3]. Recently, we provided evidence for DRS in the gas mixture SF 6 -N 2 , where we stressed the almost fully depolarized nature of the band and we reported its anisotropic spectrum [5].…”

“…1 We take this opportunity to point out an inadvertent error in our previous related work [5]. Figure 4, therein, underrates by a factor of 1.11 and 1.15 the signals I and I ⊥ , respectively.…”

“…The DRS SF 6 (ν 1 ) + N 2 (ν 1 ) band was recorded at the sum ν a + ν b (ν a = 775 cm −1 , ν b = 2330 cm −1 ) of the two fundamental vibrational stretching frequencies for the two molecules, according to a strict protocol developed in detail in the preceding paper [5]. Two independent scattering signal components, I and I ⊥ , were measured as a function of Raman frequency shift ν, depending on whether the electric field of the incident beam was polarized in the direction parallel or perpendicular to the scattering plane [6].…”

“…Such a spectrum, whose existence has been predicted theoretically, is expected to be more than one order of magnitude weaker than its anisotropic counterpart, the latter having been shown in the recent past to be sufficiently strong to whet the interest as a potentially discernible nonstandard collision-induced process [3,5]. The importance of and reason for detecting isotropic CIS spectra can be outlined in a single sentence.…”

The 2ν3 Raman overtone of sulfur hexafluoride: Absolute spectra, pressure effects, and polarizability properties

“…8 At least two studies, employing high-resolution spectroscopy, have been devoted a) Electronic mail: michel.chrysos@univ-angers.fr to the infrared spectrum of that IR-active fundamental. 9,10 In a different context entirely, collision-induced Raman or hyper-Rayleigh processes involving sulfur hexafluoride have aroused keen interest in scientists in the last two decades, [11][12][13][14][15][16] reviving interest both in collision-induced processes [17][18][19][20] and in vibrational molecular spectroscopy. [21][22][23] More recently, SF 6 became the molecule of choice for testing a new spectroscopic probe, which uses impulsive stimulated Raman scattering and coherent electrons from high harmonic generation to monitor molecular dynamics.…”