Ultraviolet absorption spectra of CdCH3, ZnCH3, and TeCH3

Abstract

Quantitative absorption and fluorescence spectroscopy of Cd(CH3)2 in vacuum ultraviolet J. Chem. Phys. 89, 160 (1988); 10.1063/1.455499 Polarizationdependent optical gain and absorption spectra of (Cd,Mn)Te and (Zn,Mn)Se multiple quantum well structures Ultraviolet absorption spectra were recorded for the transient radicals CdCH 3 • ZnCH 3 • and TeCH 3 produced in the flash photolysis of the appropriate _dimeth~ metals. F~r CdC~3 and ZnCH 3 two systems were observed and assigned to the two transitions A 'E<--X 2 At l!nd B 'E<--X 2 At. For the TeCH 3 radical only one system was observed which was assigned to the B<--X transition. The progres~ions in the spectra are assigned to the upper state carbon -metal stretching vibration (v' 3) and CH 3 symmetnc deformation vibrations (v'').

The near infrared electronic spectrum of tungsten methylidyne, WCH

“…The other two levels apparently interact quite strongly, because they show similar ⌳-doublings. The 13 392 cm Ϫ1 band, with ͉pЈ͉ϭ0.0346 cm Ϫ1 , is assigned as B -X ͑0,0͒ from its intensity, while the 13 340 cm Ϫ1 band, with ͉pЈ͉ϭ0.0191 cm Ϫ1 , is assigned to the ''dark'' state; it seems that its vibrational assignment may also be 000, since on deuteration it shifts 7 cm Ϫ1 to the blue, and neither band shows any tungsten isotope splitting, consistent with no excitation of the W-C stretching vibration, 3 .…”

Spectroscopy and Photodissociation of Dimethylzinc in Solid Argon. 1. Vacuum UV Luminescence Detection/Synchrotron Radiation Photolysis

“…The gas-phase work of Strausz and co-workers 3 and more recently Jackson,4 in which methylzinc radicals were produced by the photolysis of dimethylzinc in the presence of a buffer gas, demonstrated that the yield of methlyzinc radical increased with increasing buffer gas pressure at the expense of zinc atom production. Miller and co-workers 7 have recently exploited this behavior to produce methylzinc radical in a supersonic jet by laser photolysis of dimethylzinc under the high-collision conditions present in the throat of the expansion.…”

“…The "direct writing technique", for example, a routine method utilized in the electronics industry for writing microcircuits on semiconductor materials, 1 relies on the production of atomic zinc using a focused UV laser to dissociate dimethylzinc. As a result of its technological importance, the UV spectroscopy 2 and photodissociation of DMZ in the gas phase [3][4][5] and in molecular beams 6 have been investigated by several groups, but to date, no work has been done in the solid state. In this and the following paper in this issue, the spectroscopy and photodissociation of DMZ isolated in solid Ar is examined with vacuum UV luminescence and FTIR absorption spectroscopies, respectively.…”

The fluorescence depletion spectroscopy of CdCH3

“…As a result, the spectroscopy of the organometallic monomethyl radicals is quite well developed. The vibrationally resolved laser-induced fluorescence ͑LIF͒ spectra of the à 2 E↔X 2 A 1 transition of the monomethyls of Mg, 1 Ca, 2 Zn, [3][4][5][6][7][8] and Cd 6,9,10 have all been obtained in free jet expansions. Furthermore, rotationally resolved LIF electronic spectra have been reported for each radical, MgCH 3 , 11 CaCH 3 , 12 ZnCH 3 , 7 and CdCH 3 .…”

“…Because the fluorescence lifetimes of the 6 1 and 2 1 states are significantly shorter than the lower spin-component of the origin, we hypothesized that the upper spin-component of the origin could be dark due to a nonradiative decay mechanism. For these reasons, we undertook a fluorescence depletion ͑FD͒ investigation of the à 2 E state of CdCH 3 . Besides locating the upper spin-component of the origin, we discovered extensive vibrational structure in the FD spectrum that is not present in either the LIF or resonantly enhanced multiphoton ionization ͑REMPI͒ spectra.…”