Near-threshold electron-impact excitation of the vacuum-ultraviolet resonance transitions in Ne, Ar, Kr, and Xe

Quantum‐Mechanical Calculations of Cross Sections for Electron Collisions With Atoms and Molecules

“…The resonance structure in the metastable excitation function is reproduced in excellent agreement with the experimental data, except for an overall renormalization factor of 0.53, which is still within the overall experimental uncertainty. The principal reason for the improvement over a previous semi‐relativistic Breit–Pauli R ‐matrix calculation (BPRM‐41) in this case is the improvement in the description of the target states in this energy region. Although BSR‐31 is very good for obtaining this particular cross section, we emphasize that the model would not be not sufficient for either low‐energy elastic scattering (see above) or the intermediate‐energy regime discussed next.…”

“…Cross sections for electron‐impact excitation of the 3 p 5 4 s metastable states (the sum of the J = 2 and J = 0 states) in argon from the ground state. The experimental data of Buckman e t al., renormalized by a factor of 0.53, are compared with predictions from a BSR‐31 model and a previous BPRM‐41 calculation.…”

“…The BSR-500 predictions [48] are compared with a variety of experimental and other theoretical results. [54,60,[62][63][64][65][66][67][68][69] [70] renormalized by a factor of 0.53, are compared with predictions from a BSR-31 model [71] and a previous BPRM-41 [72] calculation. Figure 5 is an example of a systematic study regarding the convergence of the close-coupling expansion.…”

Angular Momentum Partitioning and Hexacontatetrapole Moments in Impulsively Excited Argon Ions

“…Electron-atom scattering is a prototype of the manybody long-range force problem. Our understanding of collisions with H, He, and the light alkali atoms is good [1][2][3], but calculations of scattering from the heavy noble gases are not yet satisfactory [4][5][6][7][8][9][10]. This is due primarily to the outer p-shell configuration in such atoms and the fact that relativistic effects can be important in certain collision channels.…”

Threshold Alignment Reversal and Circularly Polarized Fluorescence in Rotationally ResolvedH2

“…Generally, the value of þ1 is reduced by a number of kinematic factors internal to the target: electron spin and nuclear spin depolarization and the atomic orbital angular momentum coupling scheme [4][5][6]. Certain coupling schemes can lead to negative values of P 1 [7][8][9]. In all cases, however, threshold dynamics rigorously require that only states with M L ¼ 0 be populated at threshold.…”