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Spectroscopic Determination of Differential Collision Cross Sections in Crossed Molecular Beams

5 Spectroscopic Determination of Differential Collision Cross Sections in Crossed Molecular Beams [Pg.460]

The techniques discussed in Sects. 8.2-S.4 allowed the measurement of absolute rate constants of selected collision-induced transitions, which represent integral inelastic cross sections integrated over the angular distribution and averaged over the thermal velocity distribution of the collision partners. Much more detailed information on the interaction potential can be extracted from measured differential cross sections, obtained in crossed molecular beam experiments [958, 1074, 1075]. [Pg.460]

Assume that atoms or molecules A in a collimated beam collide with atoms or molecules B within the interaction volume V formed by the overlap of the two beams (Fig. 8.28). The number of particles A scattered per second by the angle 0 into the solid angle dQ covered by the detector D is given by [Pg.460]

With classical techniques, the energy loss of the particle A during an inelastic collision is determined by measuring its velocity before and after the collision with [Pg.460]

For polar molecules with an electric dipole moment, Rabi spectrometers with electrostatic quadrupole deflection fields offer the possibility to detect rotationally inelastic collisions since the focusing and deflecting properties of the quadrupole field depend on the quantum state J, M) of a polar molecule. This technique is, however, restricted to molecules with a large electric dipole moment and to small values of the rotational quantum number J [1076]. [Pg.461]




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Beam cross-section

Collision cross-section

Cross collision

Crossed beams

Crossed molecular beams

Molecular beam

Molecular collision

Molecular collisions cross sections

Molecular cross section

Molecular determinant

Molecular determination

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