University of Illinois Urbana-Champaign

Microwave Spectroscopy: Lineshape Approximation For Square-wave Frequency Modulation

Alekseev, E. A.

Content Files
5596.pdf
TI12_5596.pdf

Permalink

https://hdl.handle.net/2142/111421

Description

Title
Microwave Spectroscopy: Lineshape Approximation For Square-wave Frequency Modulation
Author(s)
Alekseev, E. A.
Contributor(s)
Ilyushin, V.
Issue Date
2021-06-22
Keyword(s)
Instrument/Technique Demonstration
Date of Ingest
  • 2021-09-24T21:09:43Z
  • 2022-01-21T16:08:36Z
Abstract
To improve sensitivity of absorption spectrometers a source modulation with lock-in detection is usually employed. In the Kharkiv millimeter wave spectrometer we employ DDS based square-wave frequency modulation which is characterized by a high certainty of modulation parameters. Commonly applied approaches developed for a sine-wave frequency modulation (see for example [1]) are not able to fully account for all lineshape modifications due to the square-wave frequency modulation. That is why we have developed a new expression which allows us to take into account lineshape modification due to square-wave frequency modulation as well as well-known problem of lineshape distortions caused by presence of standing wave in an absorbing cell. Our approach reproduce well observed line profiles and as the result provides some improvement of measurement accuracy. In the talk the details of the new approach will be discussed. [1] L. Dore, J. Mol. Spectrosc. 221, pp.93-98, 2003.
Publisher
International Symposium on Molecular Spectroscopy
Type of Resource
Text
Genre of Resource
Conference Paper / Presentation
Language
eng
Permalink
http://hdl.handle.net/2142/111421
DOI
10.15278/isms.2021.TI12

Owning Collections

Abstracts & Presentations - 2021 International Symposium on Molecular Spectroscopy PRIMARY