Collisional deactivation for K in high-lying2Sand2

Reaction pathway, energy barrier, and rotational state distribution for Li (2 2PJ)+H2→LiH (X 1Σ+)+H

“…In a series of reaction studies with the hydrogen molecule for excited states of Cs by Vetter and Bersohn, 1,3,9,[18][19][20][21][22][23] K by Lin and Kleiber,7,8,[11][12][13][14][15] and Rb by Luh 16,17 and their co-workers, the following results were found. First, the reactions followed a colinear collisional geometry, producing alkali hydrides predominantly via an ion-pair intermediate; however, for the case of Cs, an electron jumping distance was shorter than the harpoon model predicted.…”

“…Among the issues of reaction dynamical complexity having been studied, the reaction pathway is an issue of common concern. Thus far, the reaction pathways for K, 7,8,[11][12][13][14][15] Rb, 16,17 and Cs 1,3,9,[18][19][20][21][22][23] are found to be similar, proceeding via a harpoon mechanism in a ͑near͒ collinear collision, whereas Na 4,5,10 prefers an insertion mechanism.…”

State-specific reaction and product energy disposal of electronically excited potassium with hydrogen molecule

“…The exit into the physical quenching channel appears to dominate the total deacti- vation process. 15,16 According to the harpoon model, the surface crossing region should be located in the long-range attractive portion. Given the values of ionization potential and electron affinity, the crossing location for the 7s state reported previously corresponded to 4.1-4.8 Å.…”

“…[7][8][9][10][11][12][13][14][15][16][17] Vetter and co-workers found that in a crossed-beam experiment the CsH total cross section measured from Cs(7p 2 P 1/2 ) was four times larger than from Cs(7p 2 P 3/2 ), despite a larger energy disposal in the latter reactant. 2,7 They interpreted such a fine-structure effect as that the 2 ⌺ symmetry correlating with 7 p 2 P 1/2 level might induce an electron jump onto the ionic surface of 2 ⌺ symmetry in a C ϱ approach geometry, whereas the 2 ⌸ symmetry correlating with the 7 p 2 P 3/2 level might not.…”

Rotational and vibrational state distributions of NaH in the reactions of Na(4S2,3D2,and6S2) with H2: Insertion versus harpoon-type mechanisms

“…K, Rb, and Cs elements with larger sizes are grouped together, while Li and Na are in the other class. The harpoon model essentially holds for the chemical reactions of high-lying K, 7,[11][12][13][14][15][16] Rb, 17,18 and Cs states with H 2 . 1, 8,[19][20][21][22][23][24] The resultant products of KH, RbH, and CsH share the following common features.…”