Photodissociation spectroscopy of the chromium trimer ion |
| |
Authors: | T Majima K Tono A Terasaki Y Kawazoe T Kondow |
| |
Institution: | (1) East Tokyo Laboratory, Genesis Research Institute, Inc., 717-86 Futamata, Ichikawa, Chiba 272-0001, Japan;(2) Cluster Research Laboratory, Toyota Technological Institute, in East Tokyo Laboratory, Genesis Research Institute, Inc., 717-86 Futamata, Ichikawa, Chiba 272-0001, Japan;(3) Institute for Materials Research, Tohoku University, Sendai 980-77, Japan |
| |
Abstract: | The electronic and geometric structures and photodissociation dynamics of the chromium trimer ion, Cr3
+, were investigated by photodissociation spectroscopy in the photon-energy range from 1.32 to 5.52 eV.
The branching fractions of the product ions, Cr+ and Cr2
+, exhibit stepwise changes at the threshold energies for dissociation into Cr++Cr2, Cr+Cr2
+, Cr++2Cr, and Cr*+Cr2
+.
It is noted that Cr2
+ is produced even above the threshold for atomization; the excess energy is redistributed to produce a fragment atom, Cr*, in an excited state.
The photodissociation action spectrum is well explained by a mixture of simulated spectra for two nearly-degenerate structural
isomers identified by density functional calculations:
those having a metastable C2v structure and the most stable structure slightly distorted from the C2v one.
The barrier height between the two isomers which is lower than the zero-point energy suggests that Cr3
+ has an intrinsically floppy structure. |
| |
Keywords: | 36 40 Mr Spectroscopy and geometrical structure of clusters 36 40 Qv Stability and fragmentation of clusters 36 40 Cg Electronic and magnetic properties of clusters |
本文献已被 SpringerLink 等数据库收录! |
|