Rotational spectrum of three conformers of 3,3-difluoropentane: Construction of a 480 MHz bandwidth chirped-pulse Fourier-transform microwave spectrometer
Rotational spectrum of three conformers of 3,3-difluoropentane: Construction of a 480 MHz bandwidth chirped-pulse Fourier-transform microwave spectrometer
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3,3-二氟戊烷三种构象的旋转光谱：480 MHz 带宽啁啾脉冲傅立叶变换微波光谱仪的构建
DOI：
10.1016/j.jms.2010.03.002
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发表时间：
2010
影响因子：
1.4
通讯作者：
G. Guirgis
中科院分区：
文献类型：
--
作者：
D. Obenchain;Ashley A. Elliott;A. Steber;R. Peebles;S. Peebles;C. Wurrey;G. Guirgis
用一台新研制的窄带啁啾脉冲傅里叶变换微波光谱仪和一台Balle-Flygare谐振腔傅里叶变换微波光谱仪测量了3，3-二氟戊烷三种构象的转动光谱。啁啾脉冲仪通过将任意函数发生器输出的1μs啁啾脉冲（带宽达240 MHz）与微波合成器的输出混频，在7- 18 GHz范围内产生带宽达480 MHz的微波脉冲。正常的同位素物种和所有可能的13 C单取代的旋转光谱观察到的gauche，gauche和反gauche构象，允许Kraitchman取代结构和惯性拟合结构被确定。13 C同位素物种和偶极矩组件是不可测量的不太强烈的反反物种作为部分解决精细分裂的结果。新的啁啾脉冲仪器的细节将被描述和结构的结果将被提交和比较与从头算数据为3，3-二氟戊烷。
The rotational spectra for three conformers of 3,3-difluoropentane have been measured using both a newly constructed narrow bandwidth chirped-pulse Fourier-transform microwave spectrometer and a Balle–Flygare resonant cavity Fourier-transform microwave spectrometer. The chirped-pulse instrument produces a microwave pulse spanning up to 480MHz bandwidth in the 7–18GHz region by mixing a 1μs chirped pulse (of up to 240MHz bandwidth) from an arbitrary function generator with the output from a microwave synthesizer. Rotational spectra for the normal isotopic species and all possible13C single substitutions were observed for the gauche–gauche and anti-gauche conformers, allowing a Kraitchman substitution structure and an inertial fit structure to be determined.13C isotopic species and dipole moment components were not measurable for the less intense anti–anti species as a result of partially resolved fine splitting. Details of the new chirped-pulse instrument will be described and the structural results will be presented and compared with ab initio data for 3,3-difluoropentane.