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首页> 外文期刊>The Astrophysical journal >MICROWAVE SPECTRA, HYPERFINE STRUCTURE, AND ELECTRIC DIPOLE MOMENTS FOR CONFORMERS Ⅰ AND Ⅱ OF GLYCINE
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MICROWAVE SPECTRA, HYPERFINE STRUCTURE, AND ELECTRIC DIPOLE MOMENTS FOR CONFORMERS Ⅰ AND Ⅱ OF GLYCINE

机译：甘氨酸的Ⅰ型和Ⅱ型的微波光谱，超细结构和电偶极矩

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摘要

A number of low-J rotational transitions have been measured for two conformations of the simplest amino acid, glycine, providing precise hyperfine transition frequencies and electric dipole moments for radioastronomy searches for glycine in interstellar clouds. Measurements were made between 12 and 25 GHz with a pulsed-nozzle, Fabry-Perot-cavity, Fourier transform microwave spectrometer equipped with either a heated nozzle or laser ablation-nozzle for vaporization of solid phase glycine. Nuclear quadrupole coupling constants were determined for both conformers from measurements of the hyperfine-split rotational transitions. The quadrupole coupling constants for conformer I are eQq_(aa)= -1.208(9) MHz and eQq_(bb) = -0.343(8) MHz and for conformer Ⅱ are eQq_(aa) = 1.773(2) MHz and eQq_(bb) = -3.194(4) MHz. The dipole moment components of both conformers were determined to higher precision. We obtain μ_a =3.039(10) X 10~(-30) C m [0.911(3)D] and μ_b = 2.025(17) X 10~(-30) C m [0.607(5) D] for conformer Ⅰ, and μ_a = 17.92(11) X 10~(-30) C m [5.372(34) D] and μ_b = 3.10(3) X 10~(-30) C m [0.93(1)D] for conformer Ⅱ, where the uncertainties shown are 1 standard deviation.
机译：对于两个最简单的氨基酸构型甘氨酸，已测量了许多低J旋转跃迁，为射电天文学搜索星际云中的甘氨酸提供了精确的超精细跃迁频率和电偶极矩。使用配备有加热喷嘴或激光烧蚀喷嘴以汽化固相甘氨酸的脉冲喷嘴Fabry-Perot腔傅里叶变换微波光谱仪在12至25 GHz之间进行测量。从超细分裂旋转跃迁的测量结果确定了两个构象异构体的核四极偶合常数。一致性I的四极耦合常数为eQq_（aa）= -1.208（9）MHz和eQq_（bb）= -0.343（8）MHz，一致性II的四极耦合常数为eQq_（aa）= 1.773（2）MHz和eQq_（bb ）= -3.194（4）MHz。确定了两个构象异构体的偶极矩分量。对于构象异构体Ⅰ，我们获得μ_a= 3.039（10）X 10〜（-30）C m [0.911（3）D]和μ_b= 2.025（17）X 10〜（-30）C m [0.607（5）D]并且对于构象异构体Ⅱ，μ_a= 17.92（11）X 10〜（-30）C m [5.372（34）D]，μ_b= 3.10（3）X 10〜（-30）C m [0.93（1）D] ，其中显示的不确定度是1个标准差。

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