Electronic spectroscopy of bromomethylenes in a supersonic free jet expansion

Reassignment of the electronic origin in the system of dibromocarbene

“…We recently remeasured theà 1 B 1 X 1 A 1 system of CBr 2 using an improved pulsed discharge nozzle recipe which eliminated the interference from CHBr and Br 2 that had plagued earlier discharge studies [7]. Example experimental and simulated spectra are shown in Fig.…”

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

“…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]. For example, fluorescence excited and emission spectra of HCBr in the 450-750 nm region were reported under jet-cooled condition [13].…”

Rotationally resolved spectrum of the band of HCBr

“…Bromoform, CHBr 3 , is the dominant source of bromine-containing species in the stratosphere and its photochemistry is complicated, leading to bromine atoms and a variety of bromocarbon radicals [3] that suffer secondary photochemical reaction pathways. Bromomethylene, HCBr, is one of the radical products formed and despite the large amount of recent spectroscopic work [4][5][6][7][8][9][10][11][12][13] there remains no published high resolution spectrum in the visible. In common with all simple carbenes, the lowest electronic absorption spectrum of HCBr consists of a band system extending from near-infrared wavelengths through the visible.…”

“…Subsequent work identified the origin and other bands at near infrared wavelengths, established the vibrational numbering and analyzed high resolution spectra to obtain rotational constants and structural information. Laser induced fluorescence at visible wavelengths [11,13,15] has recently provided more information on the vibrational structure in both the ground and excited singlet states, and in combination with ab initio theory [16], identified the position of the low-lying excited triplet electronic state.…”