التفاصيل البيبلوغرافية
العنوان: |
Spectroscopy of gold atoms and gold oligomers in helium nanodroplets. |
المؤلفون: |
Messner, Roman, Schiffmann, Alexander, Pototschnig, Johann V., Lasserus, Maximilian, Schnedlitz, Martin, Lackner, Florian, Ernst, Wolfgang E. |
المصدر: |
Journal of Chemical Physics; 7/14/2018, Vol. 149 Issue 2, pN.PAG-N.PAG, 13p, 2 Diagrams, 4 Charts, 9 Graphs |
مصطلحات موضوعية: |
OLIGOMERS, HELIUM, SUPERFLUIDITY, TWO-photon-spectroscopy, PHASE transitions |
مستخلص: |
The 6 p 2 P 1 / 2 ← 6 s 2 S 1 / 2 and 6 p 2 P 3 / 2 ← 6 s 2 S 1 / 2 transitions (D lines) of gold atoms embedded in superfluid helium nanodroplets have been investigated using resonant two-photon ionization spectroscopy. Both transitions are strongly blue-shifted and broadened due to the repulsive interaction between the Au valence electron and the surrounding helium. The in-droplet D lines are superimposed by the spectral signature of Au atoms relaxed into the metastable 2D states. These features are narrower than the in-droplet D lines and exhibit sharp rising edges that coincide with bare atom transitions. It is concluded that they originate from metastable 2D state AuHen exciplexes that have been ejected from the helium droplets during a relaxation process. Interestingly, the mechanism that leads to the formation of these complexes is suppressed for very large helium droplets consisting of about 2 × 106 He atoms, corresponding to a droplet diameter on the order of 50 nm. The assignment of the observed spectral features is supported by ab initio calculations employing a multiconfigurational self-consistent field method and a multi-reference configuration interaction calculation. For large helium droplets doped with Au oligomers, excitation spectra for mass channels corresponding to Aun with n = 2, 3, 4, 5, 7, and 9 are presented. The mass spectrum reveals even-odd oscillations in the number of Au atoms that constitute the oligomer, which is characteristic for coinage metal clusters. Resonances are observed close by the in-droplet D1 and D2 transitions, and the corresponding peak forms are very similar for different oligomer sizes. [ABSTRACT FROM AUTHOR] |
|
Copyright of Journal of Chemical Physics is the property of American Institute of Physics and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) |
قاعدة البيانات: |
Complementary Index |