Multiphoton excitation of vibration-rotation states in the ν₃mode of SF₆

IR photon enhanced dissociative electron attachment to SF6: Dependence on photon, vibrational, and electron energy

“…In the present work, the laser was tuned to the lines X = 10-40, corresponding to wavenumbers of 1/k = (953-925) cm À1 . The infrared activity of the m 3 band is very high, and overtone pumping is possible for rather moderate IR intensities (0.1-10 MW/cm 2 ) [36,40]. In the present work, we apply transverse single pass excitation of the SF 6 molecules with a continuous wave, line-tunable single mode CO 2 laser (Edinburgh Instruments, model PL 5, line bandwidth 100 MHz) at powers up to 50 W and intensities up to about 400 W/cm 2 .…”

“…In the present work, we apply transverse single pass excitation of the SF 6 molecules with a continuous wave, line-tunable single mode CO 2 laser (Edinburgh Instruments, model PL 5, line bandwidth 100 MHz) at powers up to 50 W and intensities up to about 400 W/cm 2 . At these intensities, power broadening is expected to be essentially negligible [40]. The output of the CO 2 laser is shaped into a nearly parallel beam with about 8 mm diameter by a telescope and traverses a water-cooled ZnSe Brewster plate attenuator (II-VI company) which conserves the laser beam direction and profile.…”

Hot-band multiphoton absorption in SF6

“…The major exception to this rule is the excitation of the v 3 mode of SF e by intense infrared radiation from a pulsed CO 2 laser. For this system, molecular parameters derived from high-resolution spectroscopy [4][5][6][7][8][9] have allowed quantitative calculations to be performed [10][11][12][13][14] and compared with experiments using gas-dynamically cooled SF 6 [15][16][17][18]. The refinement of such calculations and experiments, and their intercomparison, offers the best hope for gaining a full quantitative understanding of the initial stages of multiphoton absorption.…”

Quantum dynamical study of molecular overtone transitions induced by intense laser radiation

“…Several classical trajectory calculations have been carried out on the muhiphoton absorption and dissociation process [13][14][15][16][17]. A statistical mechanical theory has also been formulated [18] and several quantum dynamical calculations have been performed [13,15,[19][20][21][22][23][24][25]. A significant recent development has been the .application of Floquet theory [26], by Leasure and Wyatt [19][20][21][22], to the laser-induced multiphoton excitation of the vibrational-rotational levels of diatomic molecules.…”

“…Furthermore, we consider laser fields of more practical intensities (~GW era-2). Inclusion of rotational levels in laser-molecule calculations is essential [20,24] if a realistic simulation is to be carried out.…”