Rotationally resolved resonance enhanced multiphoton ionization of NO spectra obtained at different nozzle conditions. (a) Carrier gas: He, stagnation pressures of and nozzle temperature of . (b) Carrier gas: He, stagnation pressures of and nozzle temperature of . Rotational temperatures were found to be and , respectively, from the fit to the Boltzmann distributions.
Angle-resolved energy transfer probability density functions for initially rotationally cold naphthalene [(a), (b), (c), (g), (h), and (i)] and initially rotationally hot naphthalene [(d), (e), (f), (j), (k), and (l)] at two collision energies. Thick black line, thin black line, and thick gray line represent near forward ( [(a) and (d)]; [(g) and (j)]), sideway , and backward probability density functions, respectively. The density functions at each collision energy for rotationally cold and hot naphthalene are normalized separately so that . The first column represents the up collisions energy transfer, the second column represents the down collisions energy transfer, and the third column shows the region of the maximum energy transfer.
Angle-dependence of and cross sections for initially rotationally hot (H) (thick and thin solid lines) and rotationally cold (C) (thick and thin dot lines) naphthalene, respectively. The collision energies are 102 and for rotationally cold and hot naphthalene, respectively in (a). They are 347 and for rotationally cold and hot naphthalene, respectively in (b).
Energy transfer distribution functions for rotationally cold and rotationally hot naphthalene at two different collision energies. Gray line and black line represent initially rotationally cold and hot naphthalene, respectively. The collision energies are 102 and for rotationally cold and hot naphthalene, respectively in (a). They are 347 and for rotationally cold and hot naphthalene, respectively in (b). Negative value and positive value of represent down collisions and up collisions , respectively. Each curve is normalized separately so that .
Image intensity profiles for initially rotationally hot (black line) and cold (gray line) naphthalene at collision energies of (a) and (b) . The profiles were obtained at the radius of the maximum intensity of backward peak, corresponding to the formation of complex. Part of the intensity increase at represents the formation of complex during collisions.
and are the full widths at half maximum of the naphthalene velocity distribution in the and directions, respectively. , naphthalene velocity in the laboratory frame; , naphthalene velocity in the center of mass frame; . is the uncertainty of collision energy: .
Average energy transfer and probability of large energy transfer.
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