Gas Pulse-X-Ray Probe Ambient Pressure Photoelectron Spectroscopy with Submillisecond Time Resolution
(2021) In ACS Applied Materials and Interfaces 13(40). p.47629-47641- Abstract
A setup capable of conducting gas pulse-X-ray probe ambient pressure photoelectron spectroscopy with high time resolution is presented. The setup makes use of a fast valve that creates gas pulses with an internal pressure in the mbar range and a rising edge of few hundreds of microseconds. A gated detector based on a fast camera is synchronized with the valve operation to measure X-ray photoemission spectra with up to 20 μs time resolution. The setup is characterized in several experiments in which the N2 gas is pulsed either into vacuum or a constant flow of another gas. The observed width of the pulse rising edge is 80 μs, and the maximum internal pulse pressure is ∼1 mbar. The CO oxidation reaction over Pt (111) was used to... (More)
A setup capable of conducting gas pulse-X-ray probe ambient pressure photoelectron spectroscopy with high time resolution is presented. The setup makes use of a fast valve that creates gas pulses with an internal pressure in the mbar range and a rising edge of few hundreds of microseconds. A gated detector based on a fast camera is synchronized with the valve operation to measure X-ray photoemission spectra with up to 20 μs time resolution. The setup is characterized in several experiments in which the N2 gas is pulsed either into vacuum or a constant flow of another gas. The observed width of the pulse rising edge is 80 μs, and the maximum internal pulse pressure is ∼1 mbar. The CO oxidation reaction over Pt (111) was used to demonstrate the capability of the setup to correlate the gas phase composition with that of the surface during transient supply of CO gas into an O2 stream. Thus, formation of both chemisorbed and oxide oxygen species was observed prior to CO gas perturbation. Also, the data indicated that both the Langmuir-Hinshelwood and Mars-van-Krevelen mechanisms play an important role in the oxidation of carbon monoxide under ambient conditions.
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- author
- Shavorskiy, Andrey LU ; D'Acunto, Giulio LU ; Boix De La Cruz, Virginia LU ; Scardamaglia, Mattia LU ; Zhu, Suyun LU ; Temperton, Robert H. LU ; Schnadt, Joachim LU and Knudsen, Jan LU
- organization
- publishing date
- 2021-09
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- APXPS, catalysis, CO oxidation, operando spectroscopy, time-resolved XPS
- in
- ACS Applied Materials and Interfaces
- volume
- 13
- issue
- 40
- pages
- 13 pages
- publisher
- The American Chemical Society (ACS)
- external identifiers
-
- scopus:85117174577
- pmid:34590812
- ISSN
- 1944-8244
- DOI
- 10.1021/acsami.1c13590
- language
- English
- LU publication?
- yes
- additional info
- Publisher Copyright: ©
- id
- 5db9bca9-0e03-4147-8c78-33f5a0a5e77e
- date added to LUP
- 2021-10-27 13:01:59
- date last changed
- 2024-04-20 14:20:50
@article{5db9bca9-0e03-4147-8c78-33f5a0a5e77e, abstract = {{<p>A setup capable of conducting gas pulse-X-ray probe ambient pressure photoelectron spectroscopy with high time resolution is presented. The setup makes use of a fast valve that creates gas pulses with an internal pressure in the mbar range and a rising edge of few hundreds of microseconds. A gated detector based on a fast camera is synchronized with the valve operation to measure X-ray photoemission spectra with up to 20 μs time resolution. The setup is characterized in several experiments in which the N2 gas is pulsed either into vacuum or a constant flow of another gas. The observed width of the pulse rising edge is 80 μs, and the maximum internal pulse pressure is ∼1 mbar. The CO oxidation reaction over Pt (111) was used to demonstrate the capability of the setup to correlate the gas phase composition with that of the surface during transient supply of CO gas into an O2 stream. Thus, formation of both chemisorbed and oxide oxygen species was observed prior to CO gas perturbation. Also, the data indicated that both the Langmuir-Hinshelwood and Mars-van-Krevelen mechanisms play an important role in the oxidation of carbon monoxide under ambient conditions. </p>}}, author = {{Shavorskiy, Andrey and D'Acunto, Giulio and Boix De La Cruz, Virginia and Scardamaglia, Mattia and Zhu, Suyun and Temperton, Robert H. and Schnadt, Joachim and Knudsen, Jan}}, issn = {{1944-8244}}, keywords = {{APXPS; catalysis; CO oxidation; operando spectroscopy; time-resolved XPS}}, language = {{eng}}, number = {{40}}, pages = {{47629--47641}}, publisher = {{The American Chemical Society (ACS)}}, series = {{ACS Applied Materials and Interfaces}}, title = {{Gas Pulse-X-Ray Probe Ambient Pressure Photoelectron Spectroscopy with Submillisecond Time Resolution}}, url = {{http://dx.doi.org/10.1021/acsami.1c13590}}, doi = {{10.1021/acsami.1c13590}}, volume = {{13}}, year = {{2021}}, }