混合冰晶在離子輻照中濺射粒子之質譜分析; The mass analysis of mixed ice target , H2O+CO2+NH3 , induced by ion bombardment

Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/7309

Title:	混合冰晶在離子輻照中濺射粒子之質譜分析;The mass analysis of mixed ice target , H2O+CO2+NH3 , induced by ion bombardment
Authors:	劉亞浚;Ya-Chun Liu
Contributors:	物理研究所
Keywords:	離子;冰晶;質譜分析;ion;ice;mass analysis
Date:	2003-12-01
Issue Date:	2009-09-22 10:54:54 (UTC+8)
Publisher:	國立中央大學圖書館
Abstract:	為探究宇宙中物質的組成與演化過程,在地球上的實驗室中進行了許多模擬的實驗,本實驗主要的架構是引入一不同能量的Ar+、H2+及H3+離子束轟擊在低溫的真空環境下結成冰的氣體,再由質譜儀分析濺射粒子的結果。在實驗的的過程中發現不同的分子在質譜儀處會產生分裂, 而此分裂的產物非真正表面濺射粒子的信號,所以要先測量不同分子在質譜儀處得到不同信號強度時,其分裂產生的分子片段的信號比例,最後在量得的質譜圖中扣除質譜儀產生的分裂造成的信號以獲得真正由表面濺射粒子所造成的信號。 15keV Ar+離子撞擊結成冰的H2O、CO2及NH3等單一氣體的濺射粒子種類在本實驗已得到確認,在分析離子撞擊結成冰的混合氣體方面,區分為離子撞擊結成冰的H2O及CO2混合氣體及離子撞擊結成冰的H2O、CO2及NH3兩部分,由於不同的分子可能有相同的分子量造成信號的重疊而無法進一步確認其分子的物種,但混合氣體種類較少的結果可作為分析混合氣體種類較多時的重要依據,藉以判斷混合氣體種類越多時濺射粒子的種類及是否產生新的分子的一項重要依據。 A focused 15keV and 20keV argon ion beam was used to bombard iced targets, CO2 , H2O and NH3 (at temperature (28K). The sputtered particles were analyzed by a quadrupole mass spectrometer (QMS). The purpose of the experiment is to measure the percentage of the sputtered particles actually originated from the impacting sites on the iced targets. Some percentages of particles not induced from ion-iced-target interaction include, for instance, CO, O, and C produced in the disintegration by the QMS of pure CO2, which is copiously sputtered in ion-iced CO2 interaction. The analyzed data will be useful for understanding the chemical reaction in ion-molecule interactions.
Appears in Collections:	[Graduate Institute of Physics] Electronic Thesis & Dissertation

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