摘要
用驰豫矩阵方法处理了甲基β质子各向同性超精细偶合常数在扭曲振荡调翻作用下所引起的ESR 谱的交替线宽问题,得到了构象成连续分布β质子的相关函数,谱密度函数及在快交换条件下的ESR 线宽表达式,并用其对苯乙烯本体聚合反应的全过程ESR 谱的交替线宽现象进行了分析,结果解释了交替线宽随本体聚合反应的变化,支持了对苯乙烯增长自由基ESR 谱超精细偶合常数的归属.
The relaxation-matrix theory of line width analysis in electron spin resonancespectra has been used to analyze the alternating line width effects arising from the motion of β protons of propagating radical,this motion was treated by using a Brow-nian motion model assuming a torsional oscillations about the C_α—C_β bond.The for-mula of line-width for β-protons obtained were applied to the analysis of the ESRspectra for styrene radicals in the whole process of bulk polymerization to explainthe time dependence on polymerization.The results also support the assignment ofthe β protons hfs-constants.
出处
《物理化学学报》
SCIE
CAS
CSCD
北大核心
1993年第5期610-616,共7页
Acta Physico-Chimica Sinica
关键词
ESR谱
增长自由基
苯乙烯
Alternating broaden effect
ESR
Propagating radical
Styrene
