A study of local heating of molecules under surface enhanced Raman scattering (SERS) conditions using the anti-Stokes/Stokes ratio.
We make systematic measurements of the anti-Stokes/Stokes (aS/S) ratios using low power lasers (0.5 mW at 514 and 633 nm) of rhodamine 6G (RH6G) on dried silver colloids over a wide range of temperatures from 140 to 350 K. We show that a scan in temperature allows the extraction of the contributions to the anti-Stokes/Stokes ratio from resonance effects and heating independently, thus decoupling the two aspects of the problem.
Maher
R C
RC
The Blackett Laboratory, Imperial College London, Prince Consort Road, London, UK. Robert.Maher@imperial.ac.uk
Cohen
L F
LF
Le Ru
E C
EC
Etchegoin
P G
PG