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A stop-flow sample delivery system for transient spectroscopy


Buhrke, David; Ruf, Jeannette; Heckmeier, Philipp; Hamm, Peter (2021). A stop-flow sample delivery system for transient spectroscopy. Review of Scientific Instruments, 92(12):123001.

Abstract

A stop-flow sample delivery system for transient spectroscopy is presented, which is, in particular, suited for laser-based instruments (quantum-cascade lasers or amplified femtosecond lasers) with excitation pulse repetition rates in the range 10–100 Hz. Two pulsing micro-valves are mounted onto a flow cuvette designed for transient IR spectroscopy, which is integrated into a flow cycle driven by a peristaltic pump. The performance of the system is demonstrated with transient IR experiments of the trans-to-cis photoisomerization of a water-soluble azobenzene derivative. The sample stands still when the micro-valves are closed and is pushed out from the probe beam focus on a 1 ms timescale when opening the micro-valves. The setup is extremely sample efficient. It needs only small sample volumes, and at the same time, it enables excitation of a large fraction of molecules in solution.

Abstract

A stop-flow sample delivery system for transient spectroscopy is presented, which is, in particular, suited for laser-based instruments (quantum-cascade lasers or amplified femtosecond lasers) with excitation pulse repetition rates in the range 10–100 Hz. Two pulsing micro-valves are mounted onto a flow cuvette designed for transient IR spectroscopy, which is integrated into a flow cycle driven by a peristaltic pump. The performance of the system is demonstrated with transient IR experiments of the trans-to-cis photoisomerization of a water-soluble azobenzene derivative. The sample stands still when the micro-valves are closed and is pushed out from the probe beam focus on a 1 ms timescale when opening the micro-valves. The setup is extremely sample efficient. It needs only small sample volumes, and at the same time, it enables excitation of a large fraction of molecules in solution.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Department of Chemistry
Dewey Decimal Classification:540 Chemistry
Scopus Subject Areas:Physical Sciences > Instrumentation
Uncontrolled Keywords:Instrumentation
Language:English
Date:1 December 2021
Deposited On:10 Jan 2022 12:06
Last Modified:01 Dec 2022 01:00
Publisher:American Institute of Physics
ISSN:0034-6748
OA Status:Green
Free access at:Publisher DOI. An embargo period may apply.
Publisher DOI:https://doi.org/10.1063/5.0068227
Project Information:
  • : FunderSNSF
  • : Grant ID200020B_188694
  • : Project TitleUltrafast Vibrational Spectroscopy of Allosteric Proteins (Extension)
  • Content: Published Version
  • Content: Accepted Version
  • Language: English