199^Hg＋光频标的黑体辐射频移

摘要

The background blackbody radiation causes the shift of the hyperfine energy level and affects the accuracy of the optical frequency standard. The polarizabilities of the hyperfine energy levels 5d^106s^2S1/2 （F = 0） and 5d^96s^2 2^D5/2 （F = 2） of 199Hg＋ are evaluated and the relative frequency shift at room temperature due to blackboby radiation is calculated to be -5.4 x 10^-17. Finally the effect of blackbody radiation on single 199^Hg＋ optical frequency standard is discussed at an ultralow temperature.%光学频率标准会受到环境温度的黑体辐射影响发生频移，进而影响其准确度．本文估算了珀。199^Hg＋的超精细能级5d^106s1/2（F=0）和5d^96s^2 2^D5／2（F=2）的极化率，得到了室温（300K）下黑体辐射引起的相对频移为-5．4x10^-7，最后讨论了低温环境下黑体辐射对199^Hg＋光频标的影响．