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Jet-Cooled Optical Spectroscopy of FeN between 16 300 and 21 600 cm(-1).

Aiuchi1, Shibuya

  • 1Department of Chemistry, Graduate School of Science and Engineering, Tokyo Institute of Technology, 2-12-1 Ohokayama, Meguro-ku, Tokyo, 152-8551, Japan

Journal of Molecular Spectroscopy
|January 10, 2001
PubMed
Summary

This study presents the first gas-phase spectroscopy of iron mononitride (FeN). Researchers characterized its molecular properties using laser-induced fluorescence, revealing complex electronic structures and ground state characteristics.

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Area of Science:

  • Physical Chemistry
  • Molecular Spectroscopy
  • Inorganic Chemistry

Background:

  • Iron mononitride (FeN) is a diatomic molecule with limited spectroscopic data available.
  • Understanding the electronic and structural properties of transition metal nitrides is crucial for various chemical applications.

Purpose of the Study:

  • To conduct the first gas-phase spectroscopic investigation of iron mononitride (FeN).
  • To characterize the ground and excited electronic states of FeN using laser-induced fluorescence spectroscopy.
  • To determine the Omega value of the ground state and analyze vibronic bands.

Main Methods:

  • Generation of FeN molecules via laser ablation of iron atoms reacting with ammonia (NH3) in a supersonic jet.
  • Measurement of laser-induced fluorescence excitation spectra in the 16,300–21,600 cm(-1) range.
  • Rotational analyses of vibronic bands, determination of excited state lifetimes, isotope shifts, and dispersed fluorescence spectra.

Main Results:

  • Approximately 25 vibronic bands were rotationally analyzed.
  • The ground state Omega value was determined to be 5/2, potentially corresponding to (2)Delta or (4)Pi electronic configurations.
  • Five Omega = 5/2 – XOmega = 5/2 band systems were identified, indicating complex rovibronic structures due to perturbations in excited states.

Conclusions:

  • The study provides the first comprehensive gas-phase spectroscopic data for iron mononitride (FeN).
  • The determined ground state properties and identified band systems offer fundamental insights into the electronic structure of this transition metal nitride.
  • Further theoretical and experimental studies are warranted to fully elucidate the complex electronic states and perturbations observed in FeN.