Impact Ionisation Mass Spectrometry of Cosmic Dust Analogues I: Active Asteroids and Hydrated Minerals

宇宙尘埃类似物的碰撞电离质谱分析 I：活性小行星和水合矿物

• 批准号: 414176824
• 负责人: Dr. Jonathan Hillier
• 金额: --
• 依托单位: Fachrichtung Planetologie und Fernerkundung
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2019
• 资助国家: 德国
• 起止时间: 2018-12-31 至 2023-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/414176824?language=en
• 关键词: Impact; Ionisation; Mass; Spectrometry; Cosmic

Asteroid 3200 Phaethon is an "active" asteroid, one which spectroscopically and dynamically resembles an asteroid, with no sign of surface volatiles, and yet which exhibits comet-like dust emission, generating the Geminid meteor stream.Thermal desiccation and cracking of hydrated and/or hydroxylated minerals on Phaethon has been postulated as a driver for the dust emission. However, the composition and quantity of these minerals has not been identified in dust from Phaethon and also remains poorly constrained in the general interplanetary and interstellar dust populations.The Destiny Dust Analyser (DDA) instrument (PI R. Srama, U. Stuttgart), onboard the upcoming Japanese Destiny+ spacecraft, represents a unique opportunity to measure the composition of these dusts via cation and anion impact ionisation mass spectrometry.This project will produce metal-coated, water-rich mineralogical cosmic dust analogues and electrostatically accelerate them onto laboratory impact ionisation mass spectrometers, including the DDA flight spare/laboratory models.The mass spectra produced by these grains, as well as by non-hydrated/-hydroxylated control samples, will be characterised in order to predict the mass spectra expected from naturally-occurring water-containing grains, provide calibration factors for their quantitative identification and further understand the role of impact velocity and particle mass on the generated spectra.

小行星3200菲厄冬是一颗“活跃的”小行星，在光谱和动力学上类似于小行星，没有表面挥发的迹象，但它表现出类似彗星的尘埃发射，产生了双子座流星流。菲厄冬上水合和/或羟化矿物的热干燥和破裂被认为是尘埃释放的驱动因素。然而，这些矿物的组成和数量还没有从法埃顿的尘埃中确定出来，而且在一般的星际和星际尘埃种群中仍然没有得到很好的限制。即将到来的日本命运号航天器上的命运尘埃分析仪(DDA)仪器(PiR.Srama，U·Stutgart)代表着一个独特的机会，通过阳离子和阴离子碰撞电离质谱仪来测量这些尘埃的组成。这个项目将生产金属涂层的、富含水的矿物宇宙尘埃类似物，并将它们静电加速到实验室碰撞电离质谱仪上，包括DDA飞行备用/实验室模型。将对非水化/羟化对照样品进行表征，以便预测自然产生的含水颗粒预期的质谱图，为其定量鉴定提供校准因子，并进一步了解撞击速度和颗粒质量对产生的谱图的作用。