Rotational Spectroscopy of Iodobenzene & Iodobenzene–Neon with a Direct Digital 2–8 GHz Chirped-Pulse Fourier Transform Microwave Spectrometer
Originally Published in the Journal of Molecular Spectroscopy, September 2011
Authors: Justin L Neill, Steven T. Shipman, Leonardo Alvarez-Valtierra, Alberto Lesarri, Zbigniew Kisiel, Brooks H. Pate
Summary
Originally published in the Journal of Molecular Spectroscopy, this paper presents a direct digital chirped-pulse Fourier transform microwave (CP-FTMW) spectrometer operating in the 2-8 GHz frequency range. Unlike earlier systems that required frequency mixing or multiplication, the instrument uses direct digital generation and detection, enabling high pulse quality, excellent phase stability, and simplified instrument design.
The performance of the spectrometer is demonstrated through the rotational spectroscopy of iodobenzene and an iodobenzene-neon complex. The authors detected all four singly substituted carbon-13 isotopologues of iodobenzene at natural abundance and characterized isotopic species of the iodobenzene-neon van der Waals complex. The work also demonstrates the use of microwave-microwave double-resonance experiments to facilitate spectral assignments and support molecular structure determination.
Key Takeaways
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Introduces a direct digital chirped-pulse Fourier transform microwave (CP-FTMW) spectrometer operating from 2-8 GHz.
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Eliminates the need for frequency mixing or multiplication, simplifying instrument design and operation.
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Delivers high pulse quality and phase stability for broadband rotational spectroscopy measurements.
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Detects all four singly substituted carbon-13 isotopologues of iodobenzene at natural abundance.
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Characterizes isotopic species of the iodobenzene-neon van der Waals complex.
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Demonstrates microwave-microwave double-resonance experiments to support spectral assignments and molecular analysis