摘要
在自行设计的全金属高真空热解吸系统上,以ELITESPE50型四极质谱计(QMS)为分析器,建立了金属氚化物中3He的热解吸和数据处理方法。解吸过程中,金属系统处于真空密闭状态,薄膜压力计直接测量解吸出的气体压力,质谱计则通过微量渗漏阀在线取样测量,所采集的数据均为积分形式。研究结果表明:四极质谱计标定解吸系统内4He的分压<350Pa时,其相关系数R>0.99,且记忆效应的贡献极弱;离子态氚T+对m/e=3组分分压的贡献可按IT+≈0.01IT2+确定,不干扰3He的测定;将气体解吸所得的积分数据经平滑并微分处理后可准确得到气体释放速率与退火温度的关系,即热解吸谱。
Experiments were carried out for thermodesorption measurement of 3He from metal tritides in a ultravacuum metal system. 3He analyses were performed by a quadrupole mass spectrometer (QMS). During thermal desorption, the metal system remained closed in vacuum. All gas pressures were measured by film manometer in desorption system. 3He was sampled by a leakage valve and measured by QMS. All data were displayed in integral form. The results of calibration of 4He in desorption system show that the correlation coefficient is more than 0.99 and the contribution of memory effect can be ignored. The contribution of ionized atom T+ for partial pressure of m/e = 3 is very little and is determined according to IT + ∼ 0.01 IT2 +, so the measurement of 3He can be done without interference of T+. The relationship between gases release rate and annealing temperature can be obtained after the data are smoothed and differentiated.
出处
《原子能科学技术》
EI
CAS
CSCD
北大核心
2005年第4期372-376,共5页
Atomic Energy Science and Technology
基金
国家自然科学基金资助项目(50371079)
国家自然科学基金重点项目(50131050)
中国工程物理研究院预先研究项目基金
中国工程物理研究院科学技术重大基金资助项目
关键词
^3HE
热解吸
金属氚化物
四极质谱计
Computer simulation
Data acquisition
Data processing
Desorption
Disintegration
Helium
Mass spectrometers
Radiation effects
