Photoelectron Spectroscopy of Anions at 118.2 nm. Observation of High Electron Binding Energies in Superhalogens MCI4- (M=Sc, Y, La)
- Washington State Univ., Richland, WA (United States); Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
High energy photon is needed for photoelectron spectroscopy (PES) of anions with high electron binding energies, such as superhalogens and O-rich metal oxide clusters. The highest energy photon used for anion PES in the laboratory has been 157 nm (7.866 eV) from F2 eximer lasers. Here, we report an anion PES experiment using coherent vacuum ultraviolet radiation at 118.2 nm (10.488 eV) by tripling the third harmonic output (355 nm) of a Nd:YAG laser in a Xe/Ar cell. Our study focuses on a set of superhalogen species, MCI4- (M=Sc, Y, La), which were expected to possess very high electron binding energies. While the 157 nm photon can only access the ground state detachment features for these species, more transitions to the excited states at binding energies higher than 8 eV are observed at 118.2 nm. The adiabatic detachment energies are shown to be, 6.84, 7.02, and 7.03 eV for ScCl4-, YCl4-, and LaCl4- eV, respectively, whereas their corresponding vertical detachment energies are measured to be 7.14, 7.31, and 7.38 eV.
- Research Organization:
- Pacific Northwest National Lab. (PNNL), Richland, WA (United States). Environmental Molecular Sciences Lab. (EMSL)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC05-76RL01830
- OSTI ID:
- 937043
- Report Number(s):
- PNNL-SA-61033; JCPSA6; 3170a; 25395; KP1704020; TRN: US0806061
- Journal Information:
- Journal of Chemical Physics, Vol. 128, Issue 20; ISSN 0021-9606
- Publisher:
- American Institute of Physics (AIP)
- Country of Publication:
- United States
- Language:
- English
Similar Records
Probing the Electronic Structure and Band Gap Evolution of Titanium Oxide Clusters (TiO2)n- (n=1-10) Using Photoelectron Spectroscopy
Covalently Bound Tetracoordinated Organoborons are Superhalogens: A Combined Negative Ion Photoelectron Spectroscopy and Theoretical Study