本工作观察了直链β胡萝卜素分子(溶于正己烷,浓度5×10~(-5)mol/l在80K和20K的低温下的荧光谱,激发波长分别是位于~1Bu~+(S_3)吸收光谱段的412,465,477和485nm。光谱线的特征提示:在S_3能级的上方存在另一能级S_3.谱线还表明在极低的温度下,从S_3到S_2能级以及从S_4,S_2到S_1能级之间的内转换效率明显提高。 In this work, the fluorescence spectra of linear β-carotene molecules dissolved in n-hexane at a concentration of 5 × 10 -5 mol / l at low temperature of 80K and 20K were observed. The excitation wavelengths were at ~ 1Bu ~ + (S_3 ) Absorb the spectral widths of 412, 465, 477 and 485 nm.The spectral line characteristics suggest that there is another energy level S 3 above the S 3 energy level.The spectra also show that at very low temperatures the energy levels from S 3 to S 2 and from S 4, S 2 The conversion efficiency to the S_1 level is significantly improved.