排序方式: 共有60条查询结果,搜索用时 15 毫秒
1.
Vaporizing solid samples of metals and semiconductors with a YAG Laser is a method well suited for producing molecules and
clusters of those materials. The clusters are examined by either laser-induced fluorescence (LIF) or mass spectroscopic methods.
The technique is valuable for both gas phase and matrix studies. The method is described and some applications, studying either
the structure of small metal molecules or their reactions, are reviewed, with emphasis on our recent results from the LIF
studies of LiBe, Al2 and the reaction of Al with oxygen, yielding A12O. For larger clusters, Ion Cyclotron Resonance is an extremely valuable method, as we demonstrate by its application to the
reactions of small charged silicon clusters with strong oxidising agents. 相似文献
2.
Laser induced fluorescence excitation and resolved emission spectra of 1,3-C6H4F+2 are obtained in a Ne matrix with high signal/noise despite the ion's low emission quantum yield. The ground state vibrational structure is mostly regular but that of the upper is very irregular suggesting nearly degenerate, mutually perturbing, excited states. 相似文献
3.
Ab initio calculations are reported for the simplest heteronuclear metal cluster, LiBe. Full spin-orbit configuration interaction calculations in the context of relativistic effective core potentials lead to accurate potential energy curves for low-lying states. Results are compared with recent experimental observations and with all electron multi-reference configuration interaction calculations. 相似文献
4.
Raman scattering and relaxed fluorescence is observed upon cw laser excitation resonant with the lower vibrational manifold of the X(1Σo+u) → B(3Πo+u) transition of matrix isolated Br2 at liquid He temperatures. The excitation profile of the relaxed fluorescence maps out the resonances, but neither detectable enhancement of Raman scattering nor resonance fluorescence is observed. 相似文献
5.
Liu H Yang S Balteanu I Balaj OP Fox-Beyer BS Beyer MK Bondybey VE 《Rapid communications in mass spectrometry : RCM》2004,18(13):1479-1481
A route to efficient generation of C6H4+*, potentially the benzyne radical cation, is presented. Laser vaporization of Mg+* and supersonic expansion in helium doped with o-, m-, or p-C6H4F2 yields, among other ions, o-, m-, p-C6H4F2Mg+* complexes, but no C6H4+*. Collision-induced dissociation experiments show that the o-C6H4F2Mg+* complex can be converted into C6H4+* in a mildly energetic collision, with a center-of-mass energy around 1-2 eV. These conditions can also be reached in the ion source when argon is used as a carrier gas. In this way, mass spectra containing the desired m/z 76 peak, i.e. C6H4+*, are obtained. 相似文献
6.
Two strong laser-excited fluorescence systems are observed in rare gas matrices containing Sn. Evidence is presented suggesting assignment of the emission to Sn2. The fluorescence spectrum provides a value of 188 cm?1 for the ground-state vibrational frequency of this diatomic molecule. 相似文献
7.
8.
Bi, Bi2, Bi4, and possibly Bi3 in inert-gas matrices were observed and characterized. Their spectra exhibit negligible shifts from matrix to matrix and, when known, from gas to matrix. The Bi2 Raman frequency in Ne is measured at 173 ± 1 cm?1, in excellent agreement with the gas phase. 相似文献
9.
10.