Edge effects in chirped-pulse Fourier transform microwave spectra

Journal Article · Fri Mar 27 00:00:00 EDT 2015 · Journal of Molecular Spectroscopy

DOI:https://doi.org/10.1016/j.jms.2015.03.010· OSTI ID:1548352

Park, G. Barratt ^[1]; Field, Robert W. ^[1]

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1. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)

Recent applications of chirped-pulse Fourier transform microwave and millimeter wave spectroscopy have motivated the use of short (10–50 ns) chirped excitation pulses. Here, in this regime, individual transitions within the chirped pulse bandwidth do not all, in effect, experience the same frequency sweep through resonance from far above to far below (or vice versa), and “edge effects” may dominate the relative intensities. We analyze this effect and provide simplifying expressions for the linear fast passage polarization response in the limit of long and short excitation pulses. Lastly, in the long pulse limit, the polarization response converges to a rectangular function of frequency, and in the short pulse limit, the polarization response morphs into a form proportional to the window function of the Fourier-transform-limited excitation pulse.

• Research Organization: Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences, and Biosciences Division
• Grant/Contract Number: FG02-87ER13671
• OSTI ID: 1548352
• Alternate ID(s): OSTI ID: 1246438
• Journal Information: Journal of Molecular Spectroscopy, Vol. 312, Issue C; ISSN 0022-2852
• Publisher: Elsevier
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
Chirped-pulse
Microwave spectroscopy
Millimeter waves
Dynamics