The fine and magnetic hyperfine structure of 87SrF in its X2Σ+ state
摘要:
A molecular beam rf–optical double resonance experiment was performed on 87SrF in its naturally occurring abundance ratio. The natural occurring abundances of the strontium isotopes are 86Sr (9.8%), 87Sr(7.02%) and 88Sr (82.5%). Numerous magnetic dipole allowed transitions between ρ-doublets in the X 2Σ+ state were measured to an accuracy of 3 kHz. The observed spectra were analyzed in terms of an effective Hamiltonian which includes the magnetic hyperfine and electric quadrupole interactions arising from the 87 Sr (I=9/2) and 19F (I=1/2) nuclei. The extracted spectroscopic hyperfine parameters were interpreted in terms of a simple molecular orbital picture for the electronic nature of the X 2Σ+ state. A comparison is made to previous results for the more abundant 86SrF and 88SrF isotopic forms.
Optical-optical double-resonance spectroscopy of SrF: The F 2Σ+-B 2Σ+ and G 2Π-B 2Σ+ systems
作者:C. Nitsch、J.O. Schröder、W.E. Ernst
DOI:10.1016/0009-2614(88)80288-4
日期:1988.7
Sub-Doppler optical-opticaldouble-resonance spectra of SrF were recorded using two single-mode cw dyelasers. Via the intermediate state B 2Σ+, the F 2Σ+ and G 2Π states were observed in the 32000 to 35000 cm−1 region above the ground state. The (1, 0), (2, 0), and (3, 0) bands of the F 2Σ+-B 2Σ+ transition and the (0, 0) band of the G 2Π-B 2Σ+ transition were rotationally analyzed. Rotational and vibrational
Comparison of reagent translation and vibration on the dynamics of the endothermic reaction Sr+HF
作者:Arunava Gupta、David S. Perry、Richard N. Zare
DOI:10.1063/1.439038
日期:1980.6
The endothermic reaction Sr+HF(v=0)→SrF+H has been studied as a function of collision energy (4–14 kcal/mole) using a crossed beam geometry in which a seeded HF beam intersects a thermal Sr beam. At the same total energy this reaction is compared to the Sr+HF(v=1, J=1) reaction carried out under beam-gas conditions with a pulsed HF laser as the excitation source. In both cases the SrF products are detected by laser induced fluorescence. Using the Ba+HF→BaF+H reaction as an internal reference, the cross section of the Sr+HF(v=1) reaction is found to be 1–10 times greater than for the Sr+HF(v=0) reaction when the same total energy is supplied as reagent translation. Product internal energy distribution and total relative cross sections as a function of collision energy are also measured. Phase space calculations are able to reproduce most of these results. This agreement and other arguments suggest that the Sr+HF reaction often proceeds via multiple encounters which scramble the reagent energy modes during the course of a reactive collision.