THEORY OF THE MAGNETIC AND SPECTROSCOPIC PROPERTIES OF NEPTUNIUM HEXAFLUORIDE

Journal Article · Fri Apr 01 04:00:00 EST 1960 · Proc. Roy. Soc. (London)

DOI:https://doi.org/10.1098/rspa.1960.0061· OSTI ID:4144687

Eisenstein, J C; Pryce, M H.L.

The magnetic properties and the optical absorption spectrum of NpF/sub 6/ are interpreted on the basis of an appropriate model for the molecule. The theory, in its simplest form, is not in perfect accord with all the available data. Consequently, various physical effects such as covalence, vibronic interactions, the Coriolis force on the unpaired electron, and the Jahn-Teller effect, which might affect the agreement of theory and experiment are discussed in a qualitative or semi-quantitative way. It is pointed out that the g value may vary with temperature so that one must be cautious when comparing the paramagnetic resonance and susceptibility data with theoretical predictions. The Coriolis interaction between the electron (effective) spin and the molecular rotation was found to be sufficiently large to modify the magnetic resonance frequency by an appreciable amount when rotation is free. This is proposed as a reason why paramagnetic resonance has not been observed in gaseous NpF/sub 6/. Experiments which would help to clarify the interpretation are suggested. (auth)

• Research Organization: National Bureau of Standards, Washington, D.C.; Bristol Univ., Eng.
• Sponsoring Organization: USDOE
• NSA Number: NSA-14-012987
• OSTI ID: 4144687
• Journal Information: Proc. Roy. Soc. (London), Journal Name: Proc. Roy. Soc. (London) Vol. Vol: A255
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

ABSORPTION
CORIOLIS FORCE
COVALENCE
ELECTRONS
FREQUENCY
GASES
INTERACTIONS
JAHN-TELLER EFFECT
MAGNETIC RESONANCE
MAGNETISM
METALS, CERAMICS, AND MATERIALS
MOLECULES
NEPTUNIUM FLUORIDES
ROTATION
SPECTRA
SPECTROSCOPY
TEMPERATURE