Low-lying state investigations of odd-A Mn isotopes around N=28

Based on the systematic studies for low-lying states of the odd-A^49-57Mn isotopes, the groundstates inversion and the rotational properties of a ground-state-based sequence are revealed and discussed. The energy levels of low-lying states and electromagnetic moments in odd-A^49-57Mn isotopes have been well reproduced in shell-model calculations, and the above phenomena could be understood with obviously different occupation numbers in proton orbitals such as πf_7/2...     

三重四极杆电感耦合等离子体质谱法直接测定松香中硫的含量

由于单四极杆质谱技术很难完全消除等离子体、溶剂和基体产生的多原子离子干扰，提出了题示研究。采用无水乙醇直接消解松香样品，可避免高温灰化和湿法消解造成的损失。在附加气氧气流量40 mL·min^-1条件下进行有机进样以消除积碳，采用三重四极杆电感耦合等离子体质谱仪双质量过滤器及优越的碰撞/反应池技术，使用氧气质量转移模式，去除¹⁶O⁺₂、³⁶ArC⁺等多原子离子干扰，实现松香中硫含量的稳定测试。结果表明，硫的质量浓度在100μg·L^-1以内与对应的响应强度呈线性关系，检出限为0.52μg·L^-1。对低、中、高浓度水平标准溶液测定7次，测定值的相对标准偏差均小于4.0%。按照标准加入法进行回收试验，回收率为91.2%～104%。