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

Abstract

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

“…13,14 The latter results have been explained in terms of symmetry correlation as well as existence of an energy barrier in the entrance channel. In fact, the reaction mechanisms between the Na and K excited states are different.…”

“…13,14,16,29 The radiation sources contained two tunable dye lasers, which were pumped individually by a Nd:YAG laser operating at 10 Hz with a pulse duration of 5 -8 ns. The first dye laser at wavelength was used to prepare the Na atom in the 4 2 S, 3 2 D, and 6 2 S states at / 2 = 388.5, 342.8, and 274.9 nm by twophoton absorption, using the dyes LDS 765, LDS 698, and rhodamine 575, respectively.…”

“…Similar harpoon-type reaction mechanisms have been found in the K͑n 2 S , n 2 P͒, Rb͑n 2 P͒, and Cs͑n 2 P͒ +H 2 cases. 1, 10,13,14,[17][18][19][20] The effective atomic size of alkali elements may be an important factor in determining the preference between the side-on insertion and FIG. 6.…”

“…The K͑n 2 S and n 2 P͒ plus H 2 reactions are anticipated to follow harpoon-type mechanisms via an ion-pair K + H 2 − intermediate as a likely pathway. 13,14,16 The ionization energy of K atom ͑4.34 eV͒ is smaller than that of the Na atom ͑5.14 eV͒, and thus the reaction for an excited K atom with even lower ionization energy may take place feasibly through electron transfer from K to its colliding partner at long-range distance.…”

“…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.…”