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  Application of an event-based camera for real-time velocity resolved kinetics

Golibrzuch, K., Schwabe, S., Zhong, T., Papendorf, K., & Wodtke, A. M. (2022). Application of an event-based camera for real-time velocity resolved kinetics. The Journal of Physical Chemistry A, 126(13), 2142-2148. doi:10.1021/acs.jpca.2c00806.

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 Creators:
Golibrzuch, K.1, Author              
Schwabe, S.1, Author              
Zhong, T.1, Author              
Papendorf, K.1, Author              
Wodtke, A. M.1, Author              
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1Department of Dynamics at Surfaces, Max Planck Institute for Multidisciplinary Sciences, Max Planck Society, ou_3350158              

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Free keywords: Physical Chemistry
 Abstract: We describe here the application of an inexpensive event-based/neuromorphic camera in an ion imaging experiment operated at 1 kHz detection rate to study real-time velocity-resolved kinetics of thermal desorption. Such measurements involve a single gas pulse to initiate a time-dependent desorption process and a high repetition rate laser, where each pulse of the laser is used to produce an ion image. The sequence of ion images allows the time dependence of the desorption flux to be followed in real time. In previous work where a conventional framing camera was used, the large number of megapixel-sized images required data transfer and storage rates of up to 16 GB/s. This necessitated a large onboard memory that was quickly filled and limited continuous measurement to only a few seconds. Read-out of the memory became the bottleneck to the rate of data acquisition. We show here that since most pixels in each ion image contain no data, the data rate can be dramatically reduced by using an event-based/neuromorphic camera. The data stream is thus reduced to the intensity and location information on the pixels that are lit up by each ion event together with a time-stamp indicating the arrival time of an ion at the detector. This dramatically increases the duty cycle of the method and provides insights for the execution of other high rep-rate ion imaging experiments.

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Language(s): eng - English
 Dates: 2022-02-022022-03-232022-04-07
 Publication Status: Published in print
 Pages: -
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 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1021/acs.jpca.2c00806
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Title: The Journal of Physical Chemistry A
Source Genre: Journal
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Pages: - Volume / Issue: 126 (13) Sequence Number: - Start / End Page: 2142 - 2148 Identifier: -