The pure rotational spectrum of gas-phase NaNH2 (X̃1A1)

J. Xin; M. A. Brewster; L. M. Ziurys

doi:10.1086/308373

The pure rotational spectrum of gas-phase NaNH₂ (X̃¹A₁)

J. Xin, M. A. Brewster, L. M. Ziurys

Research output: Contribution to journal › Article › peer-review

17 Scopus citations

Abstract

The pure rotational spectrum of NaNH₂ (X̃¹A₁) has been recorded using millimeter/submillimeter direct absorption techniques. This study is the first gas-phase detection of this molecule in the laboratory. NaNH₂ was generated by the reaction of sodium vapor and NH₃ in the presence of a DC discharge. The K_a = 0, 1, 2, 3, 4, and 5 components in 10 separate rotational transitions were measured, identifying the molecule as a planar, near-prolate asymmetric top with C_2v, symmetry. The data were analyzed using an S-reduced Hamiltonian, and rotational constants A, B, and C were determined, as well as various centrifugal distortion parameters. An r₀ structure was additionally calculated for the molecule. NaNH₂ may be produced in circumstellar or interstellar gas via the radiative association reaction Na⁺ + NH₃ → NaNH⁺₃ + hv, followed by dissociative electron recombination. Theoretical calculations by Petrie suggest this pathway may be sufficiently fast to synthesize detectable concentrations of NaNH₂.

Original language	English (US)
Pages (from-to)	323-328
Number of pages	6
Journal	Astrophysical Journal
Volume	530
Issue number	1 PART 1
DOIs	https://doi.org/10.1086/308373
State	Published - Feb 10 2000

Keywords

Circumstellar matter
Ism: Molecules
Line: identification
Methods: laboratory
Molecular data

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

Access to Document

10.1086/308373

Cite this

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title = "The pure rotational spectrum of gas-phase NaNH2 ({\~X}1A1)",

abstract = "The pure rotational spectrum of NaNH2 ({\~X}1A1) has been recorded using millimeter/submillimeter direct absorption techniques. This study is the first gas-phase detection of this molecule in the laboratory. NaNH2 was generated by the reaction of sodium vapor and NH3 in the presence of a DC discharge. The Ka = 0, 1, 2, 3, 4, and 5 components in 10 separate rotational transitions were measured, identifying the molecule as a planar, near-prolate asymmetric top with C2v, symmetry. The data were analyzed using an S-reduced Hamiltonian, and rotational constants A, B, and C were determined, as well as various centrifugal distortion parameters. An r0 structure was additionally calculated for the molecule. NaNH2 may be produced in circumstellar or interstellar gas via the radiative association reaction Na+ + NH3 → NaNH+3 + hv, followed by dissociative electron recombination. Theoretical calculations by Petrie suggest this pathway may be sufficiently fast to synthesize detectable concentrations of NaNH2.",

keywords = "Circumstellar matter, Ism: Molecules, Line: identification, Methods: laboratory, Molecular data",

author = "J. Xin and Brewster, {M. A.} and Ziurys, {L. M.}",

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T1 - The pure rotational spectrum of gas-phase NaNH2 (X̃1A1)

AU - Xin, J.

AU - Brewster, M. A.

AU - Ziurys, L. M.

PY - 2000/2/10

Y1 - 2000/2/10

N2 - The pure rotational spectrum of NaNH2 (X̃1A1) has been recorded using millimeter/submillimeter direct absorption techniques. This study is the first gas-phase detection of this molecule in the laboratory. NaNH2 was generated by the reaction of sodium vapor and NH3 in the presence of a DC discharge. The Ka = 0, 1, 2, 3, 4, and 5 components in 10 separate rotational transitions were measured, identifying the molecule as a planar, near-prolate asymmetric top with C2v, symmetry. The data were analyzed using an S-reduced Hamiltonian, and rotational constants A, B, and C were determined, as well as various centrifugal distortion parameters. An r0 structure was additionally calculated for the molecule. NaNH2 may be produced in circumstellar or interstellar gas via the radiative association reaction Na+ + NH3 → NaNH+3 + hv, followed by dissociative electron recombination. Theoretical calculations by Petrie suggest this pathway may be sufficiently fast to synthesize detectable concentrations of NaNH2.

AB - The pure rotational spectrum of NaNH2 (X̃1A1) has been recorded using millimeter/submillimeter direct absorption techniques. This study is the first gas-phase detection of this molecule in the laboratory. NaNH2 was generated by the reaction of sodium vapor and NH3 in the presence of a DC discharge. The Ka = 0, 1, 2, 3, 4, and 5 components in 10 separate rotational transitions were measured, identifying the molecule as a planar, near-prolate asymmetric top with C2v, symmetry. The data were analyzed using an S-reduced Hamiltonian, and rotational constants A, B, and C were determined, as well as various centrifugal distortion parameters. An r0 structure was additionally calculated for the molecule. NaNH2 may be produced in circumstellar or interstellar gas via the radiative association reaction Na+ + NH3 → NaNH+3 + hv, followed by dissociative electron recombination. Theoretical calculations by Petrie suggest this pathway may be sufficiently fast to synthesize detectable concentrations of NaNH2.

KW - Circumstellar matter

KW - Ism: Molecules

KW - Line: identification

KW - Methods: laboratory

KW - Molecular data

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