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
Pub Type: Journals
(HI)2, High-Resolution Spectrum, Submillimeter Spectrum, Quadrupole Coupling