A combination of sub-nanosecond photoexcitation and femtosecond supercontinuum probing is used to extend femtosecond transient absorption spectroscopy into the nanosecond to microsecond time domain. Employing a passively Q-switched frequency tripled Nd:YAG laser and determining the jitter of the time delay between excitation and probe pulses with a high resolution time delay counter on a single-shot basis leads to a time resolution of 350 ps in picosecond excitation mode. The time overlap of almost an order of magnitude between fs and sub-ns excitation mode permits to extend ultrafast transient absorption (TA) experiments seamlessly into time ranges traditionally covered by laser flash photolysis. The broadband detection scheme eases the identification of intermediate reaction products which may remain undetected in single-wavelength detection flash photolysis arrangements. Single-shot referencing of the supercontinuum probe with two identical spectrometer/CCD arrangements yields an excellent signal-to-noise ratio for the so far investigated chromophores in short to moderate accumulation times.
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July 2013
Research Article|
July 11 2013
Broadband ultraviolet-visible transient absorption spectroscopy in the nanosecond to microsecond time domain with sub-nanosecond time resolution
Bernhard Lang;
Bernhard Lang
a)
Department of Physical Chemistry,
University of Geneva
, 30 Quai Ernest Ansermet, CH-1211 Geneva 4, Switzerland
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Sandra Mosquera-Vázquez;
Sandra Mosquera-Vázquez
Department of Physical Chemistry,
University of Geneva
, 30 Quai Ernest Ansermet, CH-1211 Geneva 4, Switzerland
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Dominique Lovy;
Dominique Lovy
Department of Physical Chemistry,
University of Geneva
, 30 Quai Ernest Ansermet, CH-1211 Geneva 4, Switzerland
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Peter Sherin;
Peter Sherin
b)
Department of Physical Chemistry,
University of Geneva
, 30 Quai Ernest Ansermet, CH-1211 Geneva 4, Switzerland
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Vesna Markovic;
Vesna Markovic
Department of Physical Chemistry,
University of Geneva
, 30 Quai Ernest Ansermet, CH-1211 Geneva 4, Switzerland
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Eric Vauthey
Eric Vauthey
c)
Department of Physical Chemistry,
University of Geneva
, 30 Quai Ernest Ansermet, CH-1211 Geneva 4, Switzerland
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a)
Electronic mail: Bernhard.Lang@unige.ch
b)
Present address: International Tomography Center SB RAS, Institutskaya 3a, 630090 Novosibirsk, Russia.
c)
Electronic mail: Eric.Vauthey@unige.ch
Rev. Sci. Instrum. 84, 073107 (2013)
Article history
Received:
April 08 2013
Accepted:
June 18 2013
Citation
Bernhard Lang, Sandra Mosquera-Vázquez, Dominique Lovy, Peter Sherin, Vesna Markovic, Eric Vauthey; Broadband ultraviolet-visible transient absorption spectroscopy in the nanosecond to microsecond time domain with sub-nanosecond time resolution. Rev. Sci. Instrum. 1 July 2013; 84 (7): 073107. https://doi.org/10.1063/1.4812705
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