dorsal/arxiv
View SchemaA collaborative theoretical and experimental study of the structure and electronic excitation spectrum of the BAr and B(Ar)2 complexes
| Authors | Millard H. Alexander, Andrew Walton, Moonbong Yang, Xin Yang, Eunsook Hwang, Paul J. Dagdigian |
|---|---|
| Categories | |
| ArXiv ID | physics/9701017 |
| URL | https://arxiv.org/abs/physics/9701017 |
| DOI | 10.1063/1.473621 |
Abstract
We report the investigation of the 3s <- 2p transition in the BAr2 cluster. In a supersonic expansion of B atoms entrained in Ar, at high beam source backing pressures we observe several features in the fluorescence excitation spectrum which cannot be assigned to the BAr diatom. Using BAr(X, B) potential energy curves which reproduce our experimental observations on this molecule and an Ar-Ar interaction potential, we employ a pairwise additive model, along with variational and diffusion Monte-Carlo treatments of the nuclear motion, to determine the lowest vibrational state of the BAr2 cluster. A subsequent simulation of the fluorescence excitation spectrum reproduces nearly quantitatively the strongest feature in our experimental spectrum not assignable to BAr. Because of the barrier in the BAr(B 2Sigma+) potential energy curve, the 3s <- 2p transition in the BAr2 cluster is predicted to have an asymmetric profile, as is found experimentally.
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"date_created": "2026-03-02T18:01:18.020000Z",
"date_modified": "2026-03-02T18:01:18.020000Z",
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"abstract": "We report the investigation of the 3s \u003c- 2p transition in the BAr2 cluster.\nIn a supersonic expansion of B atoms entrained in Ar, at high beam source\nbacking pressures we observe several features in the fluorescence excitation\nspectrum which cannot be assigned to the BAr diatom. Using BAr(X, B) potential\nenergy curves which reproduce our experimental observations on this molecule\nand an Ar-Ar interaction potential, we employ a pairwise additive model, along\nwith variational and diffusion Monte-Carlo treatments of the nuclear motion, to\ndetermine the lowest vibrational state of the BAr2 cluster. A subsequent\nsimulation of the fluorescence excitation spectrum reproduces nearly\nquantitatively the strongest feature in our experimental spectrum not\nassignable to BAr. Because of the barrier in the BAr(B 2Sigma+) potential\nenergy curve, the 3s \u003c- 2p transition in the BAr2 cluster is predicted to have\nan asymmetric profile, as is found experimentally.",
"arxiv_id": "physics/9701017",
"authors": [
"Millard H. Alexander",
"Andrew Walton",
"Moonbong Yang",
"Xin Yang",
"Eunsook Hwang",
"Paul J. Dagdigian"
],
"categories": [
"physics.chem-ph"
],
"doi": "10.1063/1.473621",
"title": "A collaborative theoretical and experimental study of the structure and electronic excitation spectrum of the BAr and B(Ar)2 complexes",
"url": "https://arxiv.org/abs/physics/9701017"
},
"schema_id": "dorsal/arxiv",
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"variant": "snapshot-2026-03-01",
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