演題概要

2P-07

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非平衡脱離・イオン化過程観測のための飛行時間型質量分析装置の開発

(¹阪大院理・ ²アトリエモノトレム・ ³京大iCeMS)
^o王健仲¹・ 兼松泰男¹・ 邨次敦²・ 松田冬樹³・ 松田若菜¹・ 河井洋輔¹・ 豊田岐聡¹

Femtosecond laser desorption/ionization has gained attention in the last decade as a relatively new ionization technique in mass spectrometry imaging. For femtosecond lasers to achieve sample material transformation, the power density is typically between 10¹⁰ and 10¹⁶ W/cm². Most femtosecond laser applications in mass spectrometry are used as ionization methods by multiphoton absorption in a high electric field, and the pulse energy exceeds the sample ablation threshold with a power density of 10¹³~10¹⁴ W/cm². To minimize damage to the samples and explore the low-intensity femtosecond laser ionization process, we have developed a time-of-flight (TOF) mass spectrometer using the ultrashort laser pulse as the ionization source. We have added a waveplate to control the laser polarization state. By changing the directions of laser field propagation, we expect to prevent laser field-driven electrons from returning to the ion and being neutralized, which may lead to an efficient ion yield in mass spectrometry.