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Title: Observation of excited state charge transfer with fs/ps-CARS

Abstract

Excited state charge transfer processes are studied using the fs/ps-CARS probe technique. This probe allows for multiplexed detection of Raman active vibrational modes. Systems studied include Michler's Ketone, Coumarin 120, 4-dimethylamino-4'-nitrostilbene, and several others. The vibrational spectrum of the para di-substituted benzophenone Michler's Ketone in the first excited singlet state is studied for the first time. It is found that there are several vibrational modes indicative of structural changes of the excited molecule. A combined experimental and theoretical approach is used to study the simplest 7-amino-4-methylcoumarin, Coumarin 120. Vibrations observed in FTIR and spontaneous Raman spectra are assigned using density functional calculations and a continuum solvation model is used to predict how observed modes are affected upon inclusion of a solvent. The low frequency modes of the excited state charge transfer species 4-dimethylamino-4{prime}-nitrostilbene are studied in acetonitrile. Results are compared to previous work on this molecule in the fingerprint region. Finally, several partially completed projects and their implications are discussed. These include the two photon absorption of Coumarin 120, nanoconfinement in cyclodextrin cavities and sensitization of titania nanoparticles.

Authors:
 [1]
  1. Iowa State Univ., Ames, IA (United States)
Publication Date:
Research Org.:
Ames Lab., Ames, IA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
963994
Report Number(s):
IS-T 2728
TRN: US0903390
DOE Contract Number:  
AC02-07CH11358
Resource Type:
Thesis/Dissertation
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; ABSORPTION; ACETONITRILE; BENZOPHENONE; CAVITIES; COUMARIN; DETECTION; EXCITED STATES; FUNCTIONALS; KETONES; PHOTONS; PROBES; RAMAN SPECTRA; SOLVATION

Citation Formats

Blom, Alex Jason. Observation of excited state charge transfer with fs/ps-CARS. United States: N. p., 2009. Web. doi:10.2172/963994.
Blom, Alex Jason. Observation of excited state charge transfer with fs/ps-CARS. United States. https://doi.org/10.2172/963994
Blom, Alex Jason. Thu . "Observation of excited state charge transfer with fs/ps-CARS". United States. https://doi.org/10.2172/963994. https://www.osti.gov/servlets/purl/963994.
@article{osti_963994,
title = {Observation of excited state charge transfer with fs/ps-CARS},
author = {Blom, Alex Jason},
abstractNote = {Excited state charge transfer processes are studied using the fs/ps-CARS probe technique. This probe allows for multiplexed detection of Raman active vibrational modes. Systems studied include Michler's Ketone, Coumarin 120, 4-dimethylamino-4'-nitrostilbene, and several others. The vibrational spectrum of the para di-substituted benzophenone Michler's Ketone in the first excited singlet state is studied for the first time. It is found that there are several vibrational modes indicative of structural changes of the excited molecule. A combined experimental and theoretical approach is used to study the simplest 7-amino-4-methylcoumarin, Coumarin 120. Vibrations observed in FTIR and spontaneous Raman spectra are assigned using density functional calculations and a continuum solvation model is used to predict how observed modes are affected upon inclusion of a solvent. The low frequency modes of the excited state charge transfer species 4-dimethylamino-4{prime}-nitrostilbene are studied in acetonitrile. Results are compared to previous work on this molecule in the fingerprint region. Finally, several partially completed projects and their implications are discussed. These include the two photon absorption of Coumarin 120, nanoconfinement in cyclodextrin cavities and sensitization of titania nanoparticles.},
doi = {10.2172/963994},
url = {https://www.osti.gov/biblio/963994}, journal = {},
number = ,
volume = ,
place = {United States},
year = {2009},
month = {1}
}

Thesis/Dissertation:
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