Rotational spectroscopy of iodobenzene and iodobenzene–neon with a direct digital 2–8 GHz chirped-pulse Fourier transform microwave spectrometer
Rotational spectroscopy of iodobenzene and iodobenzene–neon with a direct digital 2–8 GHz chirped-pulse Fourier transform microwave spectrometer
复制标题
使用直接数字 2-8 GHz 啁啾脉冲傅立叶变换微波光谱仪对碘苯和碘苯-氖进行旋转光谱分析
DOI：
10.1016/j.jms.2011.04.016
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发表时间：
2011
影响因子：
1.4
通讯作者：
B. Pate
中科院分区：
文献类型：
--
作者：
J. Neill;S. Shipman;L. Álvarez;A. Lesarri;Z. Kisiel;B. Pate
提出了在 2-8GHz 频率范围内工作的啁啾脉冲傅立叶变换微波光谱仪的设计。线性频率扫描由采样率为 20 GS/s 的任意波形发生器生成。放大后，微波脉冲被传播到真空室中，在那里它与超音速膨胀的分子样品相互作用。产生的无分子感应衰减信号直接在数字示波器上以 20 GS/s 采样率进行放大和数字化。该光谱仪不需要混频或倍增，因此可以实现非常高的脉冲质量和相位稳定性。该光谱仪的性能通过碘苯的旋转光谱得到证明。已检测到天然丰度的所有四种不同的单取代 13 C 同位素体，以及带有氖原子的碘苯范德华簇的两种同位素。报告了碘苯和碘苯-Ne 的光谱常数和衍生结构参数。此外，还介绍了在该光谱仪中使用微波-微波双共振实验来促进光谱分配。
The design of a chirped-pulse Fourier transform microwave spectrometer operating in the 2–8GHz frequency range is presented. The linear frequency sweep is generated by an arbitrary waveform generator with a sampling rate of 20 GS/s. After amplification, the microwave pulse is broadcast into a vacuum chamber where it interacts with a supersonically expanded molecular sample. The resulting molecular free induction decay signal is amplified and digitized directly on a digital oscilloscope with a 20 GS/s sampling rate. No frequency mixing or multiplication is necessary in this spectrometer, which allows for very high pulse quality and phase stability. The performance of this spectrometer is demonstrated on the rotational spectrum of iodobenzene. All four distinct singly-substituted13C isotopologues have been detected in natural abundance, as well as two isotopic species of a van der Waals cluster of iodobenzene with a neon atom. Spectroscopic constants and derived structural parameters for iodobenzene and for iodobenzene–Ne are reported. In addition, the use of microwave–microwave double-resonance experiments in this spectrometer to facilitate spectral assignments is presented.