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Analysis of the mm- and submm-wave rotational spectra of isotopic cyanamide: New isotopologues and molecular geometry

机译:同位素氨酰胺的毫米波和亚毫米波旋转光谱分析:新的同位素和分子几何

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摘要

The rotational spectrum of cyanamide recorded for deuterated cyanamide at frequencies from 118 to 649 GHz, and more limited spectra for isotopically enriched H_2N~(13)CN and H_2~(15)NC ~(15)N were subjected to a detailed analysis using Loomis-Wood type graphical assignment techniques. Transitions in the lowest inversion doublet of 0+ and 0- substates were assigned for six new isotopic species: D_2N~(13)CN, HDN~(13)CN, HD~(15)NCN, HDNC~(15)N, H_2N~(13)CN, and H_2~(15)NC~(15)N. The data for four other species, D _2~(15)NCN, D_2NC~(15)N, H_2~(15)NCN, and H_2NC~(15)N have been considerably extended. Spectroscopic constants and the inversion splitting have been determined for all of these species from a coupled fit of the two substates. Rotational constants for all known isotopic species of cyanamide have been combined with vibration-rotation constants obtained from an ab initio calculation in an evaluation of the reSE geometry of this molecule.
机译:使用Loomis对氘化氰胺在118至649 GHz频率下记录的氰酰胺旋转光谱以及同位素富集的H_2N〜(13)CN和H_2〜(15)NC〜(15)N的更有限光谱进行了详细分析-木类型图形分配技术。为6个新的同位素物种(D_2N〜(13)CN,HDN〜(13)CN,HD〜(15)NCN,HDNC〜(15)N,H_2N)分配了最低的反转双峰形式的0+和0-亚状态。 〜(13)CN和H_2〜(15)NC〜(15)N。 D _2〜(15)NCN,D_2NC〜(15)N,H_2〜(15)NCN和H_2NC〜(15)N四个其他物种的数据已经大大扩展。已经通过两个子状态的耦合拟合确定了所有这些物种的光谱常数和反演拆分。在评估此分子的reSE几何形状时,已将所有已知的氰胺同位素物种的旋转常数与从头算得到的振动旋转常数结合在一起。

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