PMID- 22033578
OWN - NLM
STAT- MEDLINE
DCOM- 20120321
LR  - 20131121
IS  - 1463-9084 (Electronic)
IS  - 1463-9076 (Linking)
VI  - 13
IP  - 48
DP  - 2011 Dec 28
TI  - Vibrational analysis of excited and ground electronic states of all-trans retinal 
      protonated Schiff-bases.
PG  - 21402-10
LID - 10.1039/c1cp22245g [doi]
AB  - We report on vibrational coherence dynamics in excited and ground electronic 
      states of all-trans retinal protonated Schiff-bases (RPSB), investigated by 
      time-resolved Degenerate Four-Wave-Mixing (DFWM). The results show that wave 
      packet dynamics in the excited state of RPSB consist of only low-frequency (<800 
      cm(-1)) modes. Such low-frequency wave packet motion is observed over a broad 
      range of detection wavelengths ranging from excited state absorption ( approximately 500 nm) to 
      stimulated emission (>600 nm). Our results indicate that low-frequency coherences 
      in the excited state are not activated directly by laser excitation but rather by 
      internal vibrational energy redistribution. This is supported by the observation 
      that similar coherence dynamics are not observed in the electronic ground state. 
      Challenging previous experimental results, we show that the formation of 
      low-frequency coherence dynamics in RPSB does not require significant excess 
      vibrational energy deposition in the excited state vibrational manifolds. 
      Concerning ground state wave packet dynamics, we observe a set of high-frequency 
      (>800 cm(-1)) modes, reflecting mainly single and double bond stretching motion 
      in the retinal polyene-chain. Dephasing of these high-frequency coherences is 
      mode-dependent and partially differs from analogous vibrational dephasing of the 
      all-trans retinal chromophore in a protein environment (bacteriorhodopsin).
FAU - Kraack, Jan Philip
AU  - Kraack JP
AD  - Physikalisch-Chemisches Institut, Ruprecht-Karls Universitat Heidelberg, D-69210 
      Heidelberg, Germany.
FAU - Buckup, Tiago
AU  - Buckup T
FAU - Motzkus, Marcus
AU  - Motzkus M
LA  - eng
PT  - Journal Article
DEP - 20111028
PL  - England
TA  - Phys Chem Chem Phys
JT  - Physical chemistry chemical physics : PCCP
JID - 100888160
RN  - 0 (Protons)
RN  - 0 (Schiff Bases)
RN  - 53026-44-1 (Bacteriorhodopsins)
RN  - RR725D715M (Retinaldehyde)
SB  - IM
MH  - Bacteriorhodopsins/chemistry
MH  - Isomerism
MH  - Protons
MH  - Quantum Theory
MH  - Retinaldehyde/*chemistry
MH  - Schiff Bases/*chemistry
MH  - Vibration
EDAT- 2011/10/29 06:00
MHDA- 2012/03/22 06:00
CRDT- 2011/10/29 06:00
PHST- 2011/10/29 06:00 [entrez]
PHST- 2011/10/29 06:00 [pubmed]
PHST- 2012/03/22 06:00 [medline]
AID - 10.1039/c1cp22245g [doi]
PST - ppublish
SO  - Phys Chem Chem Phys. 2011 Dec 28;13(48):21402-10. doi: 10.1039/c1cp22245g. Epub 
      2011 Oct 28.