Exdtation spectroscopy

Haynes, C.L. and Van Duyne, R.P. (2003) Plasmon-sampled surface-enhanced Raman exdtation spectroscopy. Journal of Physical Chemistry B, 107, 7425-7433. 

The vacuum u.v. photodissodation of BrCN has been studied using the technique of polarized photofluorescence exdtation spectroscopy. Measurements of the fluorescence polarization estaUished that the primary excited states leading to... 

In dosing this chapter, it seems useful to acknowledge the early report by Udenfiiend and co-workers, who reported one of die earliest spectrofluorometers that allowed UV exdtation and emission. The availalHlity of such instrumuits resulted in die remarkable growth of fluorescence spectroscopy over die past 45 years. 

The sample cells used in fluorescence spectroscopy have all four sides dear, since in most instruments the fluorescence photons are detected at an angle of 90° to the propagation direction of the exdtation beam. The 90° geometry is used in order to minimize any interference in the fluorescence hght detection by the exdtation light beam. In most cases the cuvettes are made from fused silica (quartz) but if the exdtation and fluorescence wavelengths are above 300 nm plastic disposable cuvettes may be used. 

Many of the spectroscopic studies were performed to demonstrate the capability of the technique and of a number of variants which are specific for the combination of laser spectroscopy with fast beams of ions or atoms. An example has already been discussed in Section 3.3 Resonant two-photon exdtation becomes possible by adjusting the Doppler shifts for interaction with the direct and retroreflected laser beam to the atomic transition energies. Other features include the preparation of otherwise inaccessible atomic states, the separation of hyperfine structures from different isotopes by the Doppler shift, or the observation of time-resolved transient phenomena along the beam. The extensive research on nuclear moments and radii from the hyperfine structure and isotope shift constitutes a self-contained program, which will be discussed separately in Section 5. 

Ding, L.P. and Fang, Y. (2007) The study of resonance Raman scattering spectrum on the surface of Cu nanoparticles with ultraviolet exdtation and density functional theory. Spectrochimica Acta, Part A Molecular and Biomolecular Spectroscopy, 67A, 767-71. 

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