13967-22-1Relevant articles and documents
Laser spectroscopy in a pulsed jet of AlH: Ionization-detected ultraviolet absorption spectra of the transitions C 1Σ+-X 1Σ+ and b 3Σ--X 1Σ+
Zhu, Yi Fei,Shehadeh, Rana,Grant, Edward R.
, p. 883 - 893 (1992)
We report the production of radical transients AlH and AlD in a filament-source pulsed free-jet expansion.In this source, hydrogen gas from a pulsed value passes over hot tungsten filament wrapped by a layer of aluminum wire.Liquid aluminum wetting the filament reacts rapidly to form (AlH3)x oligomer.Depending of filament temperature, either AlH or AlH2 sublimes from this oligomeric coating to be entrained in subsequent pulses of H2.The source has been characterized by laser induced fluorescence and ionization-detected one-photon absorption with time-of-flight massresolution.Laser-induced fluorescence measurements focus on the well-known A-X transition of AlH.Higher energy ionization-detected absorption spectra resolve the C 1Σ+-X 1Σ+ transition in AlH and AlD, and for the first time the forbidden transition, b 3Σ--X 1Σ+, in AlH.Spectroscopic constants determined from an analysis of bands assigned to v = 0 and v = 1 of the b 3Σ- state are Te = 40 524 cm-1, Be = 7.0675 cm-1, De = 6.1 * 10-5 cm-1, αe = 0.637 cm-1, βe = 6.38 * 10-4, and γe = 1.5725, with v = 0 spin-orbit and spin-rotation coupling parameters λ0 = 0.29 cm-1, and γ0 = 0.03 cm-1, inducing structure in a transition that appears to be predominantly parallel.For v = 1, spin-orbit coupling is much stronger, and rotational branch intensities suggest interference, indicating that both parallel and perpendicular components of the transition moment contribute to the total oscillator strength.Results for the C-X (0-0) transitions give B0 = 6.3869 cm-1 and D0 = 5.329 * 10-4 with T0 = 44 594.05 cm-1 for the AlH C state, and B0 = 3.3457 cm-1 and D0 = 1.380 * 10-4 cm-1 with T0 = 44 631.09 cm-1 for the AlD C state.
High resolution infrared emission spectra of AlH and AlD
White, J. B.,Dulick, M.,Bernath, P. F.
, p. 8371 - 8378 (1993)
High resolution infrared emission spectra of aluminum monohydride and monodeuteride have been recorded.Gaseous AlH and AlD were generated by reacting molten aluminum metal with hydrogen and deuterium gas.Approximately 265 AlH lines with v = 1 -> 0 to v = 5 -> 4 and 470 AlD lines with v = 1 -> 0 to v = 7 -> 6 are reported.Dunham Yij constants were obtained by fitting the data of each isotopomer separately to the Dunham energy level expression while mass-reducd Dunham Uij constants were obtained from a combined fit of all isotopomer data.A second set of Dunham Uij constants was obtained from a fit where Uij's with j ij's fixed to values that satisfy the constraints imposed by the Dunham model.Finally, an effective Born-Oppenheimer potential was determined by fitting all the data directly to the eigenvalues of the radial Schroedinger equation containing a parametrized potential function.