Near-Infrared Spectroscopy of Bromomethylene in a Slit-Jet Expansion

Axis-Switching and Coriolis Coupling in the Ã(010)–X̃(000) Transitions of DCCl and HCCl

“…Near infrared absorption spectra were obtained using transient phase-sensitive detection of a frequency modulated, Ar + -pumped Ti:Sapphire ring laser (Coherent 899-29). Details of the FM spectroscopy techniques have been described previously (12,13).…”

“…The introduction of a Laurie-type parameter accounting for differences in the effective C-H and C-D bond lengths was not found to be helpful. Any significant improvement in the experimental structural determination will require data for the 13 C isotopomer.…”

Visible Wavelength Electronic Spectroscopy of the DCBr ÖX̃ Vibronic Transition

“…In spite of these endeavors, their spectra still defy complete analysis. Spectra of halomethylenes such as HCCl and HCBr were found to be more regular than those of CH 2 , but still very complicated (3)(4)(5)(6)(7). This complexity arises from a combination of RennerTeller, spin-orbit, and Fermi resonance couplings among three low-lying electronic states:X 1 A ,Ã 1 A , andã 3 A in the case of HCCl and HCBr.…”

“…Sears and co-workers (6,7,(9)(10)(11)(12) reported the rotationally resolved electronic spectrum of HCBr/DCBr in the near-infrared (NIR) region using laser absorption techniques and observed complicated perturbations in the high resolution spectrum. Nevertheless, except for spectra of hot bands (11,12) and the much lower resolution photoelectron spectrum of the anion (HCBr − ) published earlier (13), these experiments yield very limited information on the vibrational structure of the ground electronic state.…”

A combined ab initio and Franck–Condon simulation study of the photodetachment spectra of the HCBr− anion

“…Many studies have found that the electronic spectroscopy of HCBr is complicated, mainly because a combination of spin-orbit, Renner-Teller effect and Fermi resonance couplings among the different electronic states [9,10]. In order to learn more about their complex relationship, there have been numerous experimental and theoretical reports on the spectroscopic data of the ground and excited electronic states vibrational structure and the singlet-triplet energy gap ( E ST ) [8,11,12].…”