中文摘要：

利用金刚石对顶砧在常压至12.85GPa条件下对β-胡萝卜素进行了原位高压拉曼光谱测量,讨论了β-胡萝卜素分子特征峰频率随压力的变化规律及其π-电子离域受压力的影响。实验结果表明,β-胡萝卜素的各特征峰均向高波数移动,其主要的三个特征峰的拉曼频率与压力的关系为：ν1（C-C）=4.74P＋1 511.4,ν2（C—C）=2.55P＋1 157.6和ν3（CH3）=2.25P＋1 011.3,β-胡萝卜素的ν1＋ν2和频峰在5.38GPa的压力条件下发生劈裂。对实验结果进一步分析发现随压力增大β-胡萝卜素分子的β环扭转变化使其π-电子离域程度变弱,导致β-胡萝卜素分子主链上的碳碳双键比碳碳单键更容易压缩。

英文摘要：

In the present paper,studies on in-situ Raman spectra at high pressure up to 12.85Gpa were performed on β-carotene using a diamond anvil cell（DAC）,and the effects of pressure on the characteristic peaks andπ-electron delocalization of β-carotene were discussed.The results showed that Raman frequencies of the main characteristic peaks ofβ-carotene shifted to high wavenumber with the increase in pressure.The relation between pressure and the three main characteristic peaks of β-carotene was given as follows：ν1（C-C）=4.74P＋1 511.4,ν2（C—C）=2.55P＋1 157.6andν3（CH3）=2.25P＋1 011.3.Under the pressure of 5.38GPa,Raman spectrum of ν1＋ν2 sum frequency of β-carotene was subjected to cleavage.Fuethermore,the degree ofπ-electron decolization was reduced with the increase in pressure,leadingt o C-C double bond more compressible than C-C bond on the main chain ofβ-carotene.