NIST logo

Publication Citation: Submillimeter Spectrum and Analysis of Vibrational and Hyperfine Coupling Effects in (HI)2

NIST Authors in Bold

Author(s): Laurent H. Coudert; Sergei P. Belov; F. Willaert; B. McElmurry; R. Lucchese; John W. Bevan; Jon T. Hougen;
Title: Submillimeter Spectrum and Analysis of Vibrational and Hyperfine Coupling Effects in (HI)2
Published: October 01, 2009
Abstract: Observed rotational-vibrational transitions of HI dimer in the geared bending mode, centered at 511.9 GHz, are reported. This ~50 kHz high resolution spectrum was recorded using a co-axially configured pulsed jet submillimeter spectrometer and the hyperfine structure of R(J) and P(J) transitions from the quadrupole moments of iodine nuclei are completely resolved for low J transitions. An analysis of the hyperfine patterns was carried out using a theoretical approach accounting for the large amplitude motion effects and for hyperfine matrix elements within and between vibrational states. The submillimeter analysis is consistent with a vibrationnally averaged ground state Rcm = 4.56372(1) Å and average bending angle theta = 46.405(1) °.
Citation: Chemical Physics Letters
Volume: 482
Pages: pp. 180 - 188
Keywords: (HI)2; High-Resolution Spectrum; Submillimeter Spectrum; Quadrupole Coupling
Research Areas: Physics, Chemical Physics, Molecular Spectroscopy
PDF version: PDF Document Click here to retrieve PDF version of paper (293KB)