The pure rotational spectrum of the T-shaped AlC2 radical (~X2A1)

Halfen, DeWayne T.

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https://hdl.handle.net/2142/100599 Copy

Description

Title

The pure rotational spectrum of the T-shaped AlC2 radical (~X2A1)

Author(s)

Halfen, DeWayne T.

Contributor(s)

Ziurys, Lucy M.

Issue Date

2018-06-19

Keyword(s)

Astronomy

Abstract

The pure rotational spectrum of the AlC2 radical (X˜ 2A1) has been recorded for the first time using Fourier transform microwave/millimeter-wave (FTMmmW) techniques in the frequency range 21 – 65 GHz. AlC2 was produced in a supersonic jet from the reaction of aluminum, generated by laser ablation, with a mixture of CH4 or HCCH, diluted in argon, with a DC discharge. Three transitions (NKa,Kc = 101 → 000, 202 → 101, and 303 → 202) were measured, consisting of multiple fine/hyperfine components, resulting from the unpaired electron and the aluminum-27 nuclear spin (I = 5/2). The data were analyzed using an asymmetric top Hamiltonian and rotational, fine structure, and hyperfine constants were established. These results are in excellent agreement with previous theoretical calculations and optical spectra. An r0 structure of AlC2 was determined to be r(Al–C) = 1.924 A, ˚ r(C–C) = 1.260 A, and ˚ θ(C–Al–C) = 38.2 ◦ . The data are consistent with a T-shaped geometry with Al+C − 2 bonding. A search for AlC2 in the circumstellar envelope of IRC+10216 is currently underway.

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

text

Language

eng

Permalink

http://hdl.handle.net/2142/100599

DOI

10.15278/isms.2018.TL07

Copyright and License Information

Copyright 2018 DeWayne T. Halfen

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