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Additional info for Molecular Beams: Advances in Chemical Physics, Volume 10
36The calculations of f i j are therefore approximate and there are no compelling reasons for selecting one approximation over another. All approximations start with the transmission factor of the channel, namely, the ratio of the effusive flow leaving the channel to that entering it. Since this factor only permits the density at the exit of the duct to be established, various arguments37y38must be used to deduce the density along the duct. The value obtained for ii, in the channel is fairly insensitive to the methods used to estimate the detailed density distribution.
For the very high beam energies involved here, the thermal energy of the target atoms may be neglected and they may be considered as initially stationary but free to recoil. In such a real system the relative motion of the beam and scattering particles is confined t o a plane moving with the constant velocity of the center of mass within it. The most convenient form for the equations of motion and relations derived from them is the same as that for a hypothetical particle of mass m moving with initial velocity u toward a scatterer which is held fixed at all times.
Beam intensity vs. applied voltage at constant magnetic field of 260 gauss, for beam consisting of SPSand PO metastable argon. 260 gauss. It is seen that there are indeed two peaks, balancing at about 11 kV and 17 kV. 6 kV. Now, if one assumes that the balance peak at 11 kV is due to the MJ = + 1 state, the ratio a,( +2)/a,( + 1) x 1. However, unless positive identification of the states is achieved, the 11 kV balance peak could instead be attributable to the M , = + 2 state, corresponding to a polarizability ratio a,( +2)/a,( + 1) x 4.