Proefschrift--Amsterdam. / "Litteratuurlijst": p.[110]-111.

Thesis (M.A.)--University of California, Santa Barbara, 1989. / Includes bibliographical references (leaves 62-65).

Thesis--University of Florida. / Description based on print version record. Typescript. Vita. Includes bibliographical references (leaves 86-87).

No description available.

The objects of this research were twofold: 1. To develop apparatus and experimental techniques to shorten the exposure times in the study of the vibrational Raman effect of liquids and liquids in the solid state. 2. To use the above in the investigation of the vibrational Raman spectra of the liquid and solid states of Carbon Disulfide. Concurrently, other workers were investigating the infrared absorption spectrum of CS2. The two projects, when integrated, should give a reasonably complete basis for the description of the CS2 molecule. / Science, Faculty of / Physics and Astronomy, Department of / Graduate

No description available.

No description available.

Thesis (M.S. in Applied Physics)--Naval Postgraduate School, June 2009. / Thesis Advisor(s): Smith, Craig F. "June 2009." Description based on title screen as viewed on 14 July 2009. Author(s) subject terms: Raman spectroscopy, standoff detection, high explosives, explosive detection, inelastic scattering, resonance Raman. Includes bibliographical references (p. 77-80). Also available in print.

This dissertation details the effect of underpotentially deposited (UPD) Pb on the surface enhanced Raman scattering (SERS) ability of roughened polycrystalline Ag electrodes. The deposition of monolayer and submonolayer amounts of Pb results in a quenching of the SERS response for pyridine and Cl⁻ adsorbed at Ag electrodes. Various factors which may contribute to the loss of SERS intensity are investigated. The most significant factors include changes in surface roughness features brought about by Pb UPD, changes in surface electronic properties of Pb-modified Ag and changes in a chemical contribution to surface enhancement. Possible changes in surface roughness properties of the Ag electrode due to Pb deposition are examined using scanning electron microscopy (SEM) and SERS reversibility studies. SEMs of roughened Ag electrodes before and after Pb monolayer deposition show no significant change in the morphology of the larger roughness features. However, the deposition and stripping of 60 - 70% of a Pb monolayer results in a loss of ca. 50% of the original SERS intensity for both adsorbate bands. This irreversible loss of SERS intensity is attributed to the destruction of atomic scale roughness (ASR). These results suggest that ca. 50% of the observed SERS response arises from a mechanism involving ASR. In addition, the destruction of ASR is shown to be largely responsible for the quenching of SERS at higher Pb coverages. The morphology of the SERS quenching profiles at lower Pb coverages for pyridine and Cl⁻ varies as a function of excitation wavelength. Experimental quenching profiles are compared with theoretical quenching profiles based on an electromagnetic contribution to SERS. Theoretical quenching profiles are calculated using a model for electromagnetic enhancement at a overlayer-covered ellipsoids proposed by Murray. The experimental results for both adsorbates are in agreement with the theoretical predictions for laser excitation in the blue. Experimental results in the green and red wavelength regions are best explained in terms of photoassisted charge-transfer mechanisms for surface enhancement.

No description available.