摘要
分子离子I_2^+的禁戒跃迁光谱有可能用于测量α和μ常数的变化,并且具有增强的灵敏度.通过分析I_2^+在11860—13100 cm^(-1)范围内的转动光谱,拟合了A^2Π_(3/2)-X^2Π_(3/2)系统31个振转带的5759根吸收谱线,得到5个属于X^2Π_(3/2)态和9个属于A^2Π_(3/2)态的振动能级准确的转动光谱常数.在量子噪声极限和1 Hz跃迁线宽的条件下,计算得到X^2Π_(3/2)和X^2Π_(1/2)之间的禁戒跃迁对α和μ常数变化测量的灵敏度为δ_(α/α)≈2.37×10^(-19)a^(-1)和δ_(μ/μ)≈1.18×10^(-18)a^(-1).
The forbidden transitions of I2＋ may be used to measure the variations of α and μ constant in an enhanced sensitivity. We analyze the rotational spectrum of I2＋ between 11860 and 13100 cm-1 and assign 5759 lines to 31 bands in an A2Π3/2-X2Π3/2 system. The accurate rotational molecular constants of 5 levels in X2Π3/2 state and 9 levels in A2Π3/2 state are obtained. On condition that the signal-to-noise ratio is limited by quantum projection noise and the linewidth is 1 Hz, the forbidden transition between X2Π3/2 and X2Π1/2 should be able to achieve the sensitivities of δα/α ≈ 2.37×10-19 a-1 and δμ/μ ≈ 1.18×10-18 a-1.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2017年第23期106-111,共6页
Acta Physica Sinica
基金
国家自然科学基金(批准号:11674096,11504256)资助的课题~~
关键词
分子光谱
α常数
μ常数
碘离子光谱
精密测量
molecular spectroscopy
α constant
μ constant
spectrum of I2＋
precision measurement
