Millimeter-wave spectroscopy of MgF: Structure and bonding in alkaline-earth monofluoride radicals

M. A. Anderson, M. D. Allen, Lucy M Ziurys

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

The pure rotational spectrum of the MgF radical in its ground electronic state (X2+) has been recorded using millimeter/submillimeter direct absorption techniques. Transitions arising from the v = 0, 1, 2, and 3 vibrational modes of the main magnesium isotopic species, 24MgF, have been observed. In addition, spectra of the isotopomers 26MgF and 25MgF in the natural abundances of magnesium have been detected. Rotational and fine structure constants have been determined for these species, as well as hyperfine parameters for the fluorine nucleus (I = 1/2). For 25MgF, the hyperfine structure was also resolved arising from the magnesium nucleus, which has I=5/2, yielding the 25Mg hyperfine and quadrupole constants. Comparison of these hyperfine parameters with those of the heavier alkaline-earth monofluorides and the free 25Mg+ atom suggests that there is an increase in covalent bonding in MgF vs its heavier fluoride counterparts. This behavior is also apparent in the hybridization of the wave function of the unpaired electron in MgF, which appears to consist of almost equal s and p character.

Original languageEnglish (US)
Pages (from-to)824-830
Number of pages7
JournalThe Journal of Chemical Physics
Volume100
Issue number2
StatePublished - 1994
Externally publishedYes

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Millimeter waves
millimeter waves
Magnesium
magnesium
Earth (planet)
Spectroscopy
spectroscopy
nuclei
Fluorine
rotational spectra
Electronic states
Wave functions
hyperfine structure
Fluorides
fluorine
fluorides
vibration mode
quadrupoles
fine structure
wave functions

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Cite this

Millimeter-wave spectroscopy of MgF : Structure and bonding in alkaline-earth monofluoride radicals. / Anderson, M. A.; Allen, M. D.; Ziurys, Lucy M.

In: The Journal of Chemical Physics, Vol. 100, No. 2, 1994, p. 824-830.

Research output: Contribution to journalArticle

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N2 - The pure rotational spectrum of the MgF radical in its ground electronic state (X2∑+) has been recorded using millimeter/submillimeter direct absorption techniques. Transitions arising from the v = 0, 1, 2, and 3 vibrational modes of the main magnesium isotopic species, 24MgF, have been observed. In addition, spectra of the isotopomers 26MgF and 25MgF in the natural abundances of magnesium have been detected. Rotational and fine structure constants have been determined for these species, as well as hyperfine parameters for the fluorine nucleus (I = 1/2). For 25MgF, the hyperfine structure was also resolved arising from the magnesium nucleus, which has I=5/2, yielding the 25Mg hyperfine and quadrupole constants. Comparison of these hyperfine parameters with those of the heavier alkaline-earth monofluorides and the free 25Mg+ atom suggests that there is an increase in covalent bonding in MgF vs its heavier fluoride counterparts. This behavior is also apparent in the hybridization of the wave function of the unpaired electron in MgF, which appears to consist of almost equal s and p character.

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