Detection of Nuclear Spin Isomers of Water Molecules by Terahertz Time-Domain Spectroscopy

Alexander A. Mamrashev, Lev V. Maximov, Nazar A. Nikolaev, Pavel L. Chapovsky

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)

Abstract

Nuclear spin isomers of water molecules, i.e., ortho- and para-H<formula><tex>${}_{2}$</tex></formula>O, are quantum states of one of the most important molecules. Presently, our understanding of the water isomer properties, especially in the gas phase, remains insufficient. Scientific and practical applications of water spin isomers require the development of efficient methods of their detection in gaseous samples. In this paper, we apply the method of wideband terahertz time-domain spectroscopy to study rotational absorption spectra of ortho and para water isomers and measure their relative content in the ambient atmosphere. We find the ortho&#x002F;para ratio to be 3.03 &#x00B1; 0.03 close to the expected value of 3 when using the measurement spectral range 0.15&#x2013;1.05&#x00A0;THz.

Original languageEnglish
Article number8098617
Pages (from-to)13-18
Number of pages6
JournalIEEE Transactions on Terahertz Science and Technology
Volume8
Issue number1
DOIs
Publication statusPublished - 1 Jan 2018

Keywords

  • Absorption
  • Atmosphere
  • Atmospheric measurements
  • Nuclear spin isomers of molecules
  • ortho/para ratio
  • Rotation measurement
  • Spectroscopy
  • Terahertz radiation
  • terahertz spectroscopy
  • Time-domain analysis
  • water molecules
  • SPECTROMETER
  • CONVERSION
  • FIELD
  • OPTICAL-PROPERTIES
  • VAPOR CONTINUUM
  • SEPARATION

Fingerprint

Dive into the research topics of 'Detection of Nuclear Spin Isomers of Water Molecules by Terahertz Time-Domain Spectroscopy'. Together they form a unique fingerprint.

Cite this