from w. demtröder “molecular physics”
Post on 28-Jan-2016
36 Views
Preview:
DESCRIPTION
TRANSCRIPT
From W. Demtröder “Molecular Physics”
From W. Demtröder “Molecular Physics”
from Herzberg: Molecular Spectra & Molecular Structure
from W. Demtröder “Molecular Physics”
IR-UV Double Resonance
X, v=0
el. excited state
X, v=1
fluorescence
Technique: Fix UV laser, scan IR laser, measure fluorescence signal as function of IR frequency to obtain vibrational spectrum of ground state
Advantage: • “Action spectroscopy” – probe generation of fluorescence photons, background-free, more sensitive than IR absorption
Resonant Two-Photon Ionization (R2PI)
|0>
|k>
ionizationcontinuum
Technique: Scan laser, measure ion signal as function of laser frequency to obtain spectrum of excited state
Advantages: • Mass spectroscopic detection is very sensitive (much better than UV/vis absorption spectroscopy)• “Action spectroscopy” – probe generation of ions, background-free
top related