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Author Maher, R. C. ♦ Cohen, L. F. ♦ Gallop, J. C. ♦ Ru, E. C. Le ♦ Etchegoin, P. G.
Source CiteSeerX
Content type Text
File Format PDF
Subject Domain (in DDC) Computer science, information & general works ♦ Data processing & computer science
Subject Keyword Surface-enhanced Raman Scattering Condition ♦ Temperature-dependent Anti-stokes Stokes Ratio ♦ Ag Colloid ♦ Nm Laser ♦ Temperature Rise ♦ Main Aspect ♦ Resonance Effect ♦ Laser Power Density ♦ Raman Anti-stokes Stokes ♦ Wide Range ♦ Different Laser Excitation ♦ Surface-enhanced Raman Scattering ♦ Systematic Measurement ♦ Mode Specific Vibrational Pumping
Abstract We make systematic measurements of Raman anti-Stokes/Stokes (aS/S) ratios using two different laser excitations (514 and 633 nm) of rhodamine 6G (RH6G) on dried Ag colloids over a wide range of temperatures (100 to 350 K). We show that a temperature scan allows the separation of the contributions to the aS/S ratios from resonance effects and heating/pumping, thus decoupling the two main aspects of the problem. The temperature rise is found to be larger when employing the 633 nm laser. In addition, we find evidence for mode specific vibrational pumping at higher laser power densities. We analyze our results in the framework of ongoing discussion on laser heating/pumping under surface-enhanced Raman scattering (SERS) conditions. I.
Educational Role Student ♦ Teacher
Age Range above 22 year
Educational Use Research
Education Level UG and PG ♦ Career/Technical Study
Publisher Date 2005-01-01