Desorption of excited H* atoms from free clusters Ar/CH<sub>4</sub> and solid Ar doped with CH<sub>4</sub>

Физика Низких Температур: Том 47, Выпуск 12 (Декабрь 2021), c. 1157-1164 ( к оглавлению , назад )

Desorption of excited H* atoms from free clusters Ar/CH₄ and solid Ar doped with CH₄

Yu. S. Doronin, V. L. Vakula, G. V. Kamarchuk, А. А. Tkachenko, I. V. Khyzhniy, S. A. Uyutnov, M. A. Bludov, and E. V. Savchenko

B. Verkin Institute for Low Temperature Physics and Engineering of NAS of Ukraine, Kharkiv 61103, Ukraine
E-mail: doronin@ilt.kharkov.ua

Received August 13, 2021, published online October 25, 2021

Abstract

Desorption of excited hydrogen atoms was detected from both solid Ar doped with CH₄ and free nanoclusters Ar/CH₄ at irradiation with an electron beam. It was monitored by an emission of the Lyman-ɑ line. Measurements of cathodoluminescence (CL) spectra in the VUV range were performed within the CH₄ concentration limits 0.1–10 % in the solid matrix. The CL of free clusters with an average size of 1200 atoms per cluster was detected from pure Ar cluster jet and from Ar clusters doped with 0.1% CH₄. The mechanisms of desorption of electronically excited H* atoms from solids and clusters are proposed on the basis of an analysis of energy transfer pathways with the final stage of relaxation — population of the n = 3 state of hydrogen atoms.

Анотація

Десорбція збуджених атомів водню була виявлена як з твердого Ar, допованого CH₄, так і з вільних нанокластерів Ar/CH₄ при опроміненні електронним пучком. Десорбцію відстежували за лінією Ly-ɑ. Вимірювання спектрів катодолюмінесценції (КЛ) у діапазоні ВУФ проводили в межах концентрацій СН₄ 0,1–10 % у твердій матриці. КЛ вільних кластерів із середнім розміром 1200 атомів на кластер реєстрували з чистого кластерного струменя Ar та з кластерів Ar, допованих 0,1 % CH₄. На основі аналізу шляхів передачі енергії з кінцевою стадією релаксації — заселенням n = 3 стану атомів водню, запропоновано механізми десорбції електронно-збуджених атомів Н* з твердих тіл і кластерів.

Key words: methane, hydrogen, matrix isolation, clusters, electron irradiation, luminescence, desorption.

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Desorption of excited H* atoms from free clusters Ar/CH4 and solid Ar doped with CH4

Desorption of excited H* atoms from free clusters Ar/CH₄ and solid Ar doped with CH₄