Lamb-dip spectroscopy of the C-N stretching band of methylamine by using frequency-tunable microwave sidebands of CO(2) laser lines.
Lamb-dip spectroscopy of the C-N stretching band of methylamine by using frequency-tunable microwave sidebands of CO(2) laser lines.
复制标题
使用 CO2 激光线的频率可调谐微波边带对甲胺的 C–N 伸缩带进行兰姆浸入光谱
DOI：
10.1038/srep34270
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发表时间：
2016-09-29
影响因子：
4.6
通讯作者：
Xu LH
中科院分区：
文献类型：
--
作者：
Sun ZD;Qi SD;Lees RM;Xu LH
在亚多普勒光谱仪中，利用大量CO2激光的微波边带作为频率可调谐红外光源，将甲胺的C-N伸缩带的兰姆浸渍光谱系统地扩展到P-、Q-和R-分支。观测到150多条谱线的兰姆凹陷信号，其分辨率为0.4MHz，其频率的精确测量精度为± 0.1MHz。已经形成了30多个闭合的组合回路，这些回路明确地确认了分配。对27个亚态的150多个振动激发能级，确定了精细项的值，并将其展开为J（J + 1）幂级数，从而确定了亚态起源和有效转动常数。对于Aa扭转-反转对称性的扭转态跃迁，观测到了57条K-二重线的不对称分裂，并确定了激发态K = 1，2，3能级的分裂常数。我们的结果提供了准确的实验信息光谱研究的有趣的振动扰动和模间相互作用有关的C−N伸缩模式，直接支持天文调查，并在实践中非常相关的识别和频率确定的CO2激光泵浦的远红外激光线甲胺。
Lamb-dip spectroscopy of the C−N stretching band of methylamine has been systematically extended to P-, Q-, and R-branch by using microwave sidebands of a large number of CO2 laser lines as frequency-tunable infrared sources in a sub-Doppler spectrometer. Lamb-dip signals of more than 150 spectral lines have been observed with a resolution of 0.4 MHz and their frequencies have been precisely measured with an accuracy of ±0.1 MHz. More than 30 closed combination loops have been formed, which unambiguously confirm the assignments. For over 150 vibrational excited levels in 27 substates, refined term values have been determined and expanded in J(J + 1) power-series to determine the substate origins and the effective rotational constants. For transitions with Aa torsion-inversion symmetry in torsional state υt = 0, 57 K-doublet lines displaying asymmetry splittings have been observed and the splitting constants for levels with K = 1, 2, and 3 in the excited states have been determined. Our results provide accurate experimental information for spectroscopic studies of the interesting vibrational perturbations and intermode interactions related to the C−N stretching mode, directly support astronomical surveys, and are very relevant in practice to identification and frequency determination of the CO2-laser-pumped far-infrared laser lines of methylamine.
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影响因子：
4.3
作者：
Ilyushin, V.;Lovas, F. J.
通讯作者：
Lovas, F. J.
影响因子：
4.4
作者：
Lees, Ronald M.;Sun, Zhen-Dong;Billinghurst, B. E.
通讯作者：
Billinghurst, B. E.
影响因子：
1.4
作者：
OHASHI, N;SHIMADA, H;KAWAGUCHI, K
通讯作者：
KAWAGUCHI, K
DOI：
10.1007/s10762-007-9309-6
发表时间：
2008-02-01
期刊：
INTERNATIONAL JOURNAL OF INFRARED AND MILLIMETER WAVES
影响因子：
--
作者：
Lees, R. M.;Sun, Zhen-Dong;Xu, Li-Hong
通讯作者：
Xu, Li-Hong
影响因子：
1.7
作者：
SHIMODA, K;NISHIKAWA, T;ITOH, T
通讯作者：
ITOH, T