Regularities and irregularities in SIMS/FAB spectra of alkali halides analyzed via the bond-breaking model
Regularities and irregularities in SIMS/FAB spectra of alkali halides analyzed via the bond-breaking model
复制标题
通过键断裂模型分析碱金属卤化物 SIMS/FAB 光谱的规则性和不规则性
DOI：
10.1116/1.571938
复制
发表时间：
1983
期刊：
影响因子：
--
通讯作者：
R. Bateman
中科院分区：
文献类型：
--
作者：
B. Dunlap;J. Campana;B. Green;R. Bateman
给出了n<100时碱金属卤化物的西姆斯谱中[M（MX）n]+和[X（MX）n]-型团簇离子的相对离子强度。正离子和负离子光谱的包络非常相似，可以使用Bethe晶格上的随机键断裂模型拟合，近似于大块晶体结构。辐照发生在某些n值附近，离子强度相对于包络线增强。在这些“幻数”下的更大强度与键断裂模型一致，如果大块晶体的任何键断裂的总体概率很小。然而，降低离子强度后立即增强是唯一符合随后的单分子簇离子分解。据报告，碱金属碘化物中性原子轰击的质量分辨质谱超过m/z 25 000。
Relative ion intensities for cluster ions of the type [M(MX)n]+ and [X(MX)n]− from the SIMS spectra of alkali halides for n<100 are presented. The envelopes of the positive and negative ion spectra are quite similar and can be fit using a random bond‐breaking model on the Bethe lattice approximating the bulk crystal structure. Irregularities occur in the vicinity of certain n values with ion intensity enhanced relative to that of the envelope. The greater intensity at these ‘‘magic numbers’’ is consistent with the bond‐breaking model if the overall probability of breaking any bond of the bulk crystal is small. However, the reduced ion intensity immediately following the enhancement is only consistent with the subsequent unimolecular cluster ion decomposition. Mass‐resolved mass spectra are reported exceeding m/z 25 000 from neutral atom bombardment of alkali iodides.