The level structures of 93 Mo are investigated using Large Scale Shell Model calculations,and reasonable agreement is obtained between the experimental and calculated values.The calculated results show that the lower-...The level structures of 93 Mo are investigated using Large Scale Shell Model calculations,and reasonable agreement is obtained between the experimental and calculated values.The calculated results show that the lower-lying states are mainly dominated by proton excitations from the If5/2,2p3/2,and 2p 1/2 orbitals into the higher orbitals across the Z=38 or Z=40 subshell closure.For the higher-spin states,multi-particle excitations,including the excitation of 2 d5/2 neutrons across the N=56 subshell closure into the high-/intruder 1h 11/2 orbital,are essential.Moreover,the previously unknown spin-parity assignments of the six higher excited states in 93 Mo are inferred from the shell model calculations.展开更多
通过改变离子交换温度和时间合成了具有不同层间距的磷钨酸(H3PW12O40,HPW)插层MgAl水滑石(LDHs),采用XRD、FT-IR、Raman、31P M AS NM R、ICP-AES和Hammett指示剂-正丁胺滴定法等表征其性质,并研究其对模型原油的催化酯化脱酸性能。高...通过改变离子交换温度和时间合成了具有不同层间距的磷钨酸(H3PW12O40,HPW)插层MgAl水滑石(LDHs),采用XRD、FT-IR、Raman、31P M AS NM R、ICP-AES和Hammett指示剂-正丁胺滴定法等表征其性质,并研究其对模型原油的催化酯化脱酸性能。高的离子交换温度有利于形成较大的层间距(d003约1.46 nm),较长的交换时间有利于形成较小的层间距(d003约1.05 nm)。不同的层间距源自HPW在层间不同的存在形式,P2W18O626-以C2轴倾斜于层板和PW11O397-以C2轴垂直于层板的方式排列于层间时,形成d003约1.46 nm的层间距;PW12O403-与层板发生嫁接,并以C2轴垂直于层板的方向排列于层间时,形成d003约1.05 nm的层间距。层间P2W18O626-和PW11O397-能产生更高比例的中强酸中心,同时大的层间距有利于反应物扩散进入层间与酸中心接触,能够提高LDHs的催化酯化脱酸性能。展开更多
基金Supported by the National Natural Science Foundation of China(1177509 U1867210,11405072)Jilin Scientific and Technological Development Programs(20190201137JC,20180520195JH)+3 种基金the 13th Five-Year Plan of Scientific Research of Jilin Province(JJKH20180117KJ)China Postdoctoral Science Foundation(2015M571354,2013M541285)the National Basic Research Programme of China(2007CB815005)the Fundamental Research Funds for the Central Universities,and the Graduate Innovation Fund of Jilin University。
文摘The level structures of 93 Mo are investigated using Large Scale Shell Model calculations,and reasonable agreement is obtained between the experimental and calculated values.The calculated results show that the lower-lying states are mainly dominated by proton excitations from the If5/2,2p3/2,and 2p 1/2 orbitals into the higher orbitals across the Z=38 or Z=40 subshell closure.For the higher-spin states,multi-particle excitations,including the excitation of 2 d5/2 neutrons across the N=56 subshell closure into the high-/intruder 1h 11/2 orbital,are essential.Moreover,the previously unknown spin-parity assignments of the six higher excited states in 93 Mo are inferred from the shell model calculations.
基金This work was supported by the National Natural Science Foundation of China(52075286)the National Science and Technology Major Project of China(2011ZX02403-004)+1 种基金the National Key Research and Development Program of China(2018YFF0300606)the Tsinghua University Initiative Scientific Research Program(20193080001)。
文摘通过改变离子交换温度和时间合成了具有不同层间距的磷钨酸(H3PW12O40,HPW)插层MgAl水滑石(LDHs),采用XRD、FT-IR、Raman、31P M AS NM R、ICP-AES和Hammett指示剂-正丁胺滴定法等表征其性质,并研究其对模型原油的催化酯化脱酸性能。高的离子交换温度有利于形成较大的层间距(d003约1.46 nm),较长的交换时间有利于形成较小的层间距(d003约1.05 nm)。不同的层间距源自HPW在层间不同的存在形式,P2W18O626-以C2轴倾斜于层板和PW11O397-以C2轴垂直于层板的方式排列于层间时,形成d003约1.46 nm的层间距;PW12O403-与层板发生嫁接,并以C2轴垂直于层板的方向排列于层间时,形成d003约1.05 nm的层间距。层间P2W18O626-和PW11O397-能产生更高比例的中强酸中心,同时大的层间距有利于反应物扩散进入层间与酸中心接触,能够提高LDHs的催化酯化脱酸性能。