BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//chikkutakku.com//RDFCal 1.0//EN
X-WR-CALDESC:GoogleカレンダーやiCalendar形式情報を共有シェ
 アしましょう。近所のイベントから全国のイベントま
 で今日のイベント検索やスケジュールを決めるならち
 っくたっく
X-WR-CALNAME:ちっくたっく
X-WR-TIMEZONE:UTC
BEGIN:VEVENT
SUMMARY:Ulibarri et al. (2023) Icarus 391\, 115319
DTSTART;VALUE=DATE-TIME:20260427T070000Z
DTEND;VALUE=DATE-TIME:20260427T080000Z
UID:275670177133
DESCRIPTION:文献：Ulibarri et al. (2023) Icarus 391\, 115319題目：Hy
 pervelocity Impact Ionization of Amino-Acid-Laden Dust: First Direct Measu
 rements and Implications for Instrument Capabilities and Prebiotic Chemis
 try要旨：The detection and characterization of organic molecules in cos
 mic dust are central to understanding prebiotic chemistry and habitabilit
 y across the solar system. In particular\, amino acids serve as key biom
 arkers due to their fundamental role in terrestrial biology and their pre
 sence in abiotic extraterrestrial materials. However\, the survivability 
 and detectability of amino acids during hypervelocity impacts\, typical o
 f interplanetary dust particle (IDP) collisions and impact ionization mas
 s spectrometer (I2MS) detections\, remain poorly constrained.In this stud
 y\, we present the first direct laboratory measurements of hypervelocity 
 impact ionization of amino-acid-laden dust grains. Aluminum particles coa
 ted with histidine and arginine were accelerated at velocities ranging fr
 om ~1 to 52 km/s and analyzed using a prototype I2MS analogous to flight 
 instruments such as IDEX and SUDA. Time-of-flight mass spectra demonstrat
 e that both intact parent molecules and characteristic fragment ions surv
 ive impact and remain detectable at velocities up to at least ～6-7 km/s
 .These results provide critical validation for the capability of I2MS ins
 truments to identify organic compounds in situ during space missions and 
 suggest that amino acids can persist under relevant hypervelocity conditi
 ons. Consequently\, continuous bombardment by IDPs may represent a viable
  mechanism for the delivery and redistribution of prebiotic molecules acr
 oss planetary environments. This work establishes a new experimental fram
 ework for assessing organic survivability and enhances confidence in futu
 re astrobiological investigations of dust populations throughout the sola
 r system.話者：Zachary Ernest Ulibarri (Cornell Univ.)言語：英語
LOCATION:
END:VEVENT
END:VCALENDAR