Infrared photodissociation spectroscopy of Ag{sub n}(C{sub 6}H{sub 6}){sub m} and Ag{sub n}(C{sub 6}D{sub 6}){sub m} clusters: Evidence of adsorption-induced symmetry reduction in benzene

PDF Version Also Available for Download.

Description

Photodepletion spectroscopy has emerged in recent years as a powerful tool for probing the optical response of both neutral and charged metal clusters. Comparison of measured spectra with theoretical predictions has allowed for inferences about size-specific cluster structures. The vibrations of benzene-h{sub 6} and benzene-d{sub 6} on single crystal metal surfaces have been thoroughly investigated using a number surface science technique. On silver surfaces, it has been found that benzene adsorbs weakly, with vibrational frequencies that are shifted downward by approximately 5 cm{sup {minus}1} relative to those of gas-phase benzene. Furthermore, modes which are inactive for gas-phase benzene are seen ... continued below

Physical Description

12 p.

Creation Information

Koretsky, G.M. & Knickelbein, M.B. September 24, 1996.

Context

This report is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided by UNT Libraries Government Documents Department to Digital Library, a digital repository hosted by the UNT Libraries. It has been viewed 18 times . More information about this report can be viewed below.

Who

People and organizations associated with either the creation of this report or its content.

Authors

Sponsor

Publisher

Provided By

UNT Libraries Government Documents Department

Serving as both a federal and a state depository library, the UNT Libraries Government Documents Department maintains millions of items in a variety of formats. The department is a member of the FDLP Content Partnerships Program and an Affiliated Archive of the National Archives.

Contact Us

What

Descriptive information to help identify this report. Follow the links below to find similar items on the Digital Library.

Description

Photodepletion spectroscopy has emerged in recent years as a powerful tool for probing the optical response of both neutral and charged metal clusters. Comparison of measured spectra with theoretical predictions has allowed for inferences about size-specific cluster structures. The vibrations of benzene-h{sub 6} and benzene-d{sub 6} on single crystal metal surfaces have been thoroughly investigated using a number surface science technique. On silver surfaces, it has been found that benzene adsorbs weakly, with vibrational frequencies that are shifted downward by approximately 5 cm{sup {minus}1} relative to those of gas-phase benzene. Furthermore, modes which are inactive for gas-phase benzene are seen when the benzene is adsorbed to the surface, showing that although the interaction is weak, it is sufficient to lower the symmetry of the benzene from D{sub 6h} to C{sub 3v} ({sigma}{sub d}). The orientation of the benzene relative to the surface remains a point of controversy. It seems likely that the orientation depends upon the coverage. The observation of the a{sub 1g} C-C breathing mode of benzene in infrared photodepletion measurements of Ag{sub n}Bz{sub m} clusters demonstrates that there is a reduction in the benzene symmetry when it is adsorbed on silver clusters. Furthermore, the absence of detection of the e{sub 1u} mode for most clusters investigated suggests that the surface selection rule may apply even in these very small systems. Experiments to further probe the infrared response of M{sub n}Bz{sub m} (M = coinage metal) clusters are ongoing.

Physical Description

12 p.

Notes

OSTI as DE97007860

Source

  • Other Information: PBD: 24 Sep 1996

Language

Item Type

Identifier

Unique identifying numbers for this report in the Digital Library or other systems.

  • Other: DE97007860
  • Report No.: ANL/CHM/PP--91337
  • Grant Number: W-31109-ENG-38
  • DOI: 10.2172/510289 | External Link
  • Office of Scientific & Technical Information Report Number: 510289
  • Archival Resource Key: ark:/67531/metadc698834

Collections

This report is part of the following collection of related materials.

Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

What responsibilities do I have when using this report?

When

Dates and time periods associated with this report.

Creation Date

  • September 24, 1996

Added to The UNT Digital Library

  • Aug. 14, 2015, 8:43 a.m.

Description Last Updated

  • Dec. 16, 2015, 12:40 p.m.

Usage Statistics

When was this report last used?

Yesterday: 0
Past 30 days: 1
Total Uses: 18

Interact With This Report

Here are some suggestions for what to do next.

Start Reading

PDF Version Also Available for Download.

Citations, Rights, Re-Use

Koretsky, G.M. & Knickelbein, M.B. Infrared photodissociation spectroscopy of Ag{sub n}(C{sub 6}H{sub 6}){sub m} and Ag{sub n}(C{sub 6}D{sub 6}){sub m} clusters: Evidence of adsorption-induced symmetry reduction in benzene, report, September 24, 1996; Illinois. (digital.library.unt.edu/ark:/67531/metadc698834/: accessed November 24, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.