Pyrolysis jet spectroscopy, in which precursor species are heated to pyrolysis temperatures just prior to expansion from the nozzle of a supersonic free jet, is demonstrated to be a viable technique for the production and characterization of rotationally cold transient molecules and free radicals.
Pyrolysis jet spectroscopy of dichlorosilylene
โ Scribed by J. Karolczak; Dennis J. Clouthier
- Publisher
- Elsevier Science
- Year
- 1993
- Tongue
- English
- Weight
- 514 KB
- Volume
- 201
- Category
- Article
- ISSN
- 0009-2614
No coin nor oath required. For personal study only.
โฆ Synopsis
The laser-induced fluorescence spectrum of SK& in the near-ultraviolet has been recorded using the pyrolysis jet technique. Pyrolysis of SiHCls has been shown to be an effective method of producing SiCla for spectroscopic studies. The spectra show resolved rotational subband structure and chlorine isotope effects. The fundamental vibrational frequencies are v; = 521.6 cm-', ~;=200.6 cm-', u', ~428.9 cm-' and u;= 149.8 cm-', and the band origin is at 30013.5 cm-'. By comparison with the analogous spectra of CCll and GeCla, the band system is assigned to the A 'Br-2 'A, electronic transition.
๐ SIMILAR VOLUMES
The short-lived molecule chloroketene (ClHCCO) was generated by the pyrolysis of chloroacetyl chloride in a hightemperature nozzle and the infrared laser-absorption spectrum of its 2 fundamental band was measured between 2153 and 2161 cm ฯช1 . The spectrum was greatly simplified by comparison with a
Resonant two-photon ionization spectroscopy has been used to study the supersonically cooled metal cluster, A&u. One electronic band system has been observed, with the origin band at I7525 cm-'. Vibronic progressions have been found and analyzed using a least-squares fitting procedure. The molecule
Direct absorption spectra ofjet-cooled molecules are recorded by m$tipassing an infrared laser beam through a nozzle expansion and with all light rays perpendicular to the nozzle axis. A small blade is placed just upstream of the laser crossing to obstruct the passage of molecules that would otherwi