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Keysight Technologies
High-Speed Broadband
Spectroscopy Measurements
Advance Molecular Research
Application Note
Introduction
Rotational spectroscopy has allowed the identification of hundreds of complex molecules and has
enabled scientists to better understand the laws of the universe including the origins of life on Earth.
The rotational spectra of small molecules can be analyzed by optical methods in the infrared
spectrum, however, the rotational transitions offer better resolution in mixtures and better specificity
to molecular geometry.
The Keysight Technologies, Inc. next generation data conversion technologies have enabled the
development of a new technique called segmented chirped pulse Fourier transform millimeter
(CP-FTmmW) spectroscopy capable of extending spectroscopic measurements to other wavebands
(millimeter/sub-millimeter and terahertz) to provide the precise rotational fingerprint of molecules.
Abstract
Spectroscopy measures the interaction between a sample and electromagnetic radiation (light).
Light can be emitted (emission spectroscopy), absorbed (absorption spectroscopy) or scattered by
a sample. Molecular spectroscopy can be used to determine the composition of a substance since a
molecule's dynamics are uniquely affected by specific frequencies of light.
Molecular Rotational Resonance (MRR) spectroscopy, a form of molecular spectroscopy, enables the
accurate identification of the molecular structure of gas phase molecules based on the change of
angular momentum when interacting with the light field.
Recent improvements in electronic instrumentation have enabled the development of a chirped pulse
Fourier transform millimeter-wave (CP-FTmmW) spectrometer capable of measuring the 260