Diatomic atoms

Atom) (Diatomic (Diatomic (Atom) molecule) molecule)... 

Spectral moments. The spectral moments of the rototranslational bands are defined according to Eqs. 3.5 and 3.6. For diatom-atom pairs like H2-Ar, the expressions... 

Fig. 5. Coordinate system used for one-electron diatomic atoms. The two nuclei are on the z axis with charges Z, and Z2, separated by a distance R, and the electron (e ) is a distance r from the origin. See text for details.

Following the procedures outlined in Ref. 47, the dissociation probability at the high vibrational levels for diatom-atom collisions is derived as ... 

If the time scale is defined by the collision frequency of a bath atom with either of the diatomic atoms, a simple expression for the average transfer is derived. 

The quantity X(e) = 0(1 - e) / [l - (1 - e) / ] isjust the mean kinetic energy of the Morse oscillator. For collinear diatom-atom collisions, Nesbitt and Hynesderived a phase-averaged hard-sphere model in which... 

Not much later, after the temperature had dropped to less than 103 K, the first diatomic atoms began to form when two neutral hydrogen atoms combined to form a hydrogen molecule ... 

The primary difficulty arises from the fact that although it is most convenient to carry out the scattering calculation in a coupled basis [section 2] in which the total angular momentum is a good quantum number, the wavefunction of two atoms at infinite separation can best be expressed in an uncoupled basis. To illustrate this point, consider the initial state of the diatomic (atom+laser-excited atom) prior to collision. Prior to the collision the relative oibital angular momentum d is always oriented peipendicular to the collision plane, in other words d is always perpendicular to the collision-frame z-axis, which, as discussed in section 3, is coincident with Vj i, the initial relative velocity vector. If the electric field vector of the pump laser, which defines the laboratoiy-fixed Z axis, is chosen to lie parallel to Vi i(Fig. 3), and if we consider a P<- S excitation process, then, as discussed in section 3, only the P =o(ij=l ttij=0>) atomic state is prepared [13-15,31]. Since Z and Vj i are coincident pnor to the collision, the collision-frame and laboratory-frame z-axes are identical This we shall refer to as parallel... 

Crossed-beam experiments naturally produce flux velocity-angle contour maps, which can be measured with considerable detail. Applications include a variety of atom-diatom reactions, ion-molecule reactions, complex mode reactions, diatom atom reactions, etc. Examples are to be found throughout the text. For the special case when the reaction is photoinitiated we return to this... 

For a chain of diatomic atoms (or ions) with different masses, the dispersion relation separates into two branches an acoustic branch and an optical branch. In the vicinity of fc = 0, the dispersion relations are given for the optical branch and the acoustic branch, respectively, by = 2/3//a 2/3(fca) /(M -I- m), where a is the spacing between the individual... 

Some detailed mappings of potential surfaces for diatomic -atom complexes in form of equation (3) have appeared and are reviewed elsewhere. For van der Waals molecules containing two chemically... 

Some rare gas dimer structures are shown to the left of Fig. 3. For these Tq is taken from the analysis of Docken and Schafer.In the second column are some diatomic -atom complexes. The arrows on the H2 Ar structure remind us that this is a free rotor complex and H2 can rotate (almost) freely against Ar. The remaining... 

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