Raman spectroscopy of single light-absorbing carbonaceous particles levitated in air using an annular laser beam

2020 Fiscal Year Final Research Report

• Project/Area Number: 18H02006
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Review Section: Basic Section 34020:Analytical chemistry-related
• Research Institution: Hiroshima University
• Principal Investigator: Ishizaka Shoji 広島大学, 先進理工系科学研究科(理), 教授 (80311520)
• Co-Investigator(Kenkyū-buntansha): 中川 真秀 広島大学, 理学研究科, 助教 (70814903)
• Project Period (FY): 2018-04-01 – 2021-03-31
• Keywords: 界面・微粒子分析 / レーザー分光

Outline of Final Research Achievements

Carbonaceous particles are one of the biggest uncertainties in climate modeling. Particularly, the generation mechanism of cloud droplets with soot particles as a scaffold is very complicated, so it is strongly desired to develop a novel experimental approach that can characterize individual soot particles levitated in air. In this study, we constructed a new laser trapping and Raman spectroscopy system capable of trapping single carbonaceous particles in air, in which an annular laser beam was employed as a trapping light source.

Free Research Field

分析化学

Academic Significance and Societal Importance of the Research Achievements

エアロゾルを足場とした雲粒の発生過程は、気候変動予測における最大の不確定要素である。本研究で開発したドーナツビーム型エアロゾル粒子捕捉法を駆使し、エアロゾル粒子ごとに、大気中でどのように化学反応が進行するか、また、どの湿度で水滴に変化するかを計測するこが可能である。将来、雲がどの高度にどのくらいの頻度と寿命で発生するかを正確に予測することができるようになれば、その意義は大変大きい。