Angular resolved energy transfer probability density functions. The thin black line represents forward scatterings ( for the first column and for the second column), the thick gray line represents sideway scattering , and the thick black line represents backward scatterings . In the first and third columns, the sideway and backward scatterings have been multiplied by some factors, respectively (as shown in the figure), such that they and forward scattering have the same value at . In the second column, they are plotted in the same scale.
Energy transfer probability density functions for 2-methylnaphthalene (thick black) and naphthalene (thick gray and thin black). The thick black curve and thick gray curve are normalized so that ; the thin black curve is normalized so that .
Molecular beam speed ratios and the uncertainties in collision energies. and are the full width at half maximum of the naphthalene or 2-methylnaphthalene velocity distribution in and directions, respectively. is the naphthalene or 2-methylnaphthalene velocity in the laboratory frame; is the naphthalene or 2-methylnaphthalene velocity in the center-of-mass frame; . is the uncertainty in collision energy. .
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