Approaching the Lower Temporal Limit of Laser-Produced Plasma Sources for Table-Top Soft X-ray NEXAFS Measurements
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arXiv
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| Auteurs principaux: | , , |
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| Format: | Preprint |
| Publié: |
2024
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| _version_ | 1866912025422069760 |
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| author | Nimlos, Danika Arellano, Alejandro Cushing, Scott Kevin |
| author_facet | Nimlos, Danika Arellano, Alejandro Cushing, Scott Kevin |
| contents | The increasing popularity of time-resolved X-ray absorption measurements for understanding dynamics in molecular and material systems has led to many advances in table-top sources for pulsed X-rays. We report on a table top laser-produced plasma (LPP) source that can perform soft X-ray (SXR), near edge X-ray absorption fine structure (NEXAFS) measurements using a laser source with 23 ps pulse duration. The spectrometer's key specifications, such as brilliance, resolution, and stability, are characterized against the more commonly used longer-pulse-duration LPP sources. The 23 ps laser produced approximately an order of magnitude weaker SXR flux than the 8 ns laser for a higher power density due to the smaller total energy absorbed by the plasma. The increased repetition rate and an implemented self-referencing scheme still allowed for high-resolution, synchrotron-like NEXAFS measurements of Si3N4 and TiO2 thin films with 2.5 minute acquisition times. It was observed that degradation of the gas jet nozzle led to long-term instability of the source, which can be remediated using alternative nozzle designs. This work demonstrates the feasibility of achieving higher temporal resolution in future time-resolved X-ray absorption measurements using table-top laser-produced plasma sources |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2409_02280 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Approaching the Lower Temporal Limit of Laser-Produced Plasma Sources for Table-Top Soft X-ray NEXAFS Measurements Nimlos, Danika Arellano, Alejandro Cushing, Scott Kevin Instrumentation and Detectors Chemical Physics Plasma Physics The increasing popularity of time-resolved X-ray absorption measurements for understanding dynamics in molecular and material systems has led to many advances in table-top sources for pulsed X-rays. We report on a table top laser-produced plasma (LPP) source that can perform soft X-ray (SXR), near edge X-ray absorption fine structure (NEXAFS) measurements using a laser source with 23 ps pulse duration. The spectrometer's key specifications, such as brilliance, resolution, and stability, are characterized against the more commonly used longer-pulse-duration LPP sources. The 23 ps laser produced approximately an order of magnitude weaker SXR flux than the 8 ns laser for a higher power density due to the smaller total energy absorbed by the plasma. The increased repetition rate and an implemented self-referencing scheme still allowed for high-resolution, synchrotron-like NEXAFS measurements of Si3N4 and TiO2 thin films with 2.5 minute acquisition times. It was observed that degradation of the gas jet nozzle led to long-term instability of the source, which can be remediated using alternative nozzle designs. This work demonstrates the feasibility of achieving higher temporal resolution in future time-resolved X-ray absorption measurements using table-top laser-produced plasma sources |
| title | Approaching the Lower Temporal Limit of Laser-Produced Plasma Sources for Table-Top Soft X-ray NEXAFS Measurements |
| topic | Instrumentation and Detectors Chemical Physics Plasma Physics |
| url | https://arxiv.org/abs/2409.02280 |