Pulse-Height Distribution Analysis for Superconducting Nanostripline Ion Detector with a Fast Pulse-Integration Analog-Todigital Converter

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• 作者：Koji Suzuki ; Masahiro Ukibe ; Shigetomo Shiki ; Shigehito Miki ; Zhen Wang ; Yoshihiro Takahashi ; Nobuyuki Yoshikawa ; Masataka Ohkubo
• 关键词：superconducting nano-stripline ion detector ; pulse-integation analog-to-digital converter ; NbN ; mass spectrometry ; pulse-height measurement
• 刊名：Physics Procedia
• 出版年：2012
• 出版时间：2012
• 年：2012
• 卷：36
• 期：Complete
• 页码：172-176
• 全文大小：544 K

文摘

Superconducting nano-stripline structure is promising for realizing an ideal ion detector for mass spectrometry (MS); nano-second time resolution and mass-independent detection efficiency from atoms to proteins. We report the first pulse-height spectra of a superconducting nano-stripline ion detector (SSLD) by a pulse-integration analog-to-digital converter (PIADC). A niobium nitride (NbN)-SSLD had a meander structure of the stripline with a thickness of 10 nm and a linewidth of 800 nm on an MgO substrate. A matrix-assisted laser desorption/ionization (MALDI) time-of-flight (TOF) mass spectrometer or a double-focusing mass spectrometer was used to produce and accelerate biomolecule ions (bovine serum albumin) with a molecular weight (MW) of 66,400 and Ar ions with an atomic weight (AW) of 40. Output pulse height did not depend on the MW or ion species for a wide mass range. Moreover, measured pulse-height distribution indicates that our SSLD system is so fast enough to discriminate the simultaneous ion incidence within 200 ns, which is close to the virtual dead time of time-to-digital converters (TDCs) at the practical usage in TOF MS for macromolecules.