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Related Experiment Videos

High-Resolution Coherent Raman Spectra of Vibrationally Excited 14N2 and 15N2

Orlov1, Ogilvie, Nibler

  • 1Department of Chemistry, Oregon State University, Corvallis, Oregon, 97331-4003

Journal of Molecular Spectroscopy
|September 1, 1997
PubMed
Summary

High-resolution Raman spectroscopy of nitrogen isotopes (14N2 and 15N2) precisely determined molecular constants. This study provides accurate spectroscopic data for the nitrogen molecule

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Area of Science:

  • Molecular Spectroscopy
  • Quantum Chemistry
  • Physical Chemistry

Background:

  • Accurate molecular constants are crucial for understanding chemical processes and atmospheric phenomena.
  • Nitrogen (N2) is a key component of Earth's atmosphere, and its spectroscopic properties are fundamental.
  • Previous spectroscopic studies of N2 have provided valuable data, but higher resolution and precision are often needed.

Purpose of the Study:

  • To precisely measure and analyze the coherent anti-Stokes Raman spectra (CARS) of electrically discharged 14N2 and 15N2.
  • To determine accurate spectroscopic parameters, including term coefficients and potential-energy coefficients, for both nitrogen isotopes.
  • To investigate the influence of pressure, AC Stark, and interference effects on spectral line positions.

Main Methods:

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  • Measurement of coherent anti-Stokes Raman spectra (CARS) at an effective resolution of 0.001 cm-1.
  • Analysis of Q, O, and S branches for vibrational bands up to v'=8 (14N2) and v'=7 (15N2).
  • Separate spectral data fitting for each isotopic variant, incorporating literature data, to derive molecular constants.

Main Results:

  • Accurate harmonic vibrational parameters (omegae) determined: 2358.5402(4) cm-1 for 14N2 and 2278.7913(7) cm-1 for 15N2.
  • Spectroscopic coefficients (Ykl, Ukl, cj) derived, reproducing measured spectral lines within 0.004 cm-1.
  • Attempts to resolve adiabatic and non-adiabatic effects by combining isotopic data were unsuccessful.

Conclusions:

  • The study successfully obtained high-precision spectroscopic data for 14N2 and 15N2, yielding accurate molecular constants.
  • The derived parameters provide a refined understanding of the nitrogen molecule's electronic ground state.
  • Further theoretical or experimental approaches may be needed to fully elucidate adiabatic and non-adiabatic effects in N2.