Pulsed ion deflection to overcome detector saturation in cryogenic ice sampling
Abstract
In 2014, we introduced a new experimental approach to study the UV photo-processing of cryogenic ices of astrophysical interest using laser ablation in combination with ionization and time-of-flight mass spectrometry (ToF-MS). The setup, MATRI2CES (Mass Analytical Tool to Research Interstellar ICES), allowed us to detect newly formed species at low abundances. However, we found that with increasing molecular complexity, the detection of larger photoproducts was hindered by the dynamic range of the detector. Here, we introduce a method to overcome this issue that we expect to be useful for similar applications in other research fields. The concept is based on a precisely controlled high-energy pulser that regulates the voltage across the deflection plates of the ToF-MS to deflect the most abundant species and prevent them from reaching the detector. In this way, the detector sensitivity can be increased from an operating voltage of 2500~V up to 3000~V. The applicability is first illustrated using an argon matrix, in which 40Ar+ ions are deflected to increase the detection sensitivity for 40Ar2+ at m/z=20 and 40Ar2+ at m/z=80 by a factor of 30. Similarly, we show that substantially larger complex organic molecules can be measured in UV-irradiated methanol ice.
Versions
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BibTeX
@misc{samarth2026pulsed,
title = {{Pulsed ion deflection to overcome detector saturation in cryogenic ice sampling}},
author = {P. Samarth and M. Bulak and D. Paardekooper and K. -J. Chuang and H. Linnartz},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.17873},
eprint = {2609.17873},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.17873},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Pulsed ion deflection to overcome detector saturation in cryogenic ice sampling
AU - P. Samarth
AU - M. Bulak
AU - D. Paardekooper
AU - K. -J. Chuang
AU - H. Linnartz
PY - 2026
DA - 2026/09/15
PB - arXiv
DO - 10.48550/arxiv.2609.17873
UR - https://arxiv.org/abs/2609.17873
AB - In 2014, we introduced a new experimental approach to study the UV photo-processing of cryogenic ices of astrophysical interest using laser ablation in combination with ionization and time-of-flight mass spectrometry (ToF-MS). The setup, MATRI^2CES (Mass Analytical Tool to Research Interstellar ICES), allowed us to detect newly formed species at low abundances. However, we found that with increasing molecular complexity, the detection of larger photoproducts was hindered by the dynamic range of the detector. Here, we introduce a method to overcome this issue that we expect to be useful for similar applications in other research fields. The concept is based on a precisely controlled high-energy pulser that regulates the voltage across the deflection plates of the ToF-MS to deflect the most abundant species and prevent them from reaching the detector. In this way, the detector sensitivity can be increased from an operating voltage of 2500~V up to 3000~V. The applicability is first illustrated using an argon matrix, in which ^40Ar^+ ions are deflected to increase the detection sensitivity for ^40Ar^2+ at m/z=20 and ^40Ar_2^+ at m/z=80 by a factor of 30. Similarly, we show that substantially larger complex organic molecules can be measured in UV-irradiated methanol ice.
ER -