High-Resolution Fourier Spectrometry of the (14)N(+)(2) Ion.

Area of Science:

• Molecular Spectroscopy
• Quantum Chemistry
• Atomic and Molecular Physics

Background:

• The B(2)Sigma(+)(u) --> X(2)Sigma(+)(g) electronic transition in the nitrogen molecule ion ((14)N(+)(2)) is crucial for understanding molecular behavior.
• Previous rotational analyses were limited in scope, necessitating further investigation into higher vibrational levels.

Purpose of the Study:

• To extend rotational analyses of the B(2)Sigma(+)(u) --> X(2)Sigma(+)(g) system of (14)N(+)(2) to higher vibrational levels (v' = 4).
• To perform a global deperturbation to accurately determine molecular and interaction parameters.
• To identify and characterize new perturbations within the B(2)Sigma(+) state.

Main Methods:

• High-resolution Fourier transform spectrometry was employed to acquire spectral data.
• Data from a hollow-cathode lamp and a Pointolite lamp were utilized.
• Global deperturbation analysis was performed on spectral data from 20 bands.

Main Results:

• Molecular parameters for the perturbed B(2)Sigma state and interaction parameters between A(2)Pi(u) and B(2)Sigma(u) states were determined with high accuracy (standard deviation of 0.011 cm(-1)).
• Rotational term values for the B(2)Sigma(+) state were calculated.
• Novel perturbations in the B(2)Sigma(+) (v = 0) level were identified at specific rotational quantum numbers (N ≈ 85 and N ≈ 96).

Conclusions:

• The study successfully extended the rotational analysis of the (14)N(+)(2) B-X system to higher vibrational levels.
• The deperturbation analysis provided precise molecular and interaction parameters, improving the understanding of electronic state interactions.
• The discovery of new perturbations offers insights into the complex energy level structure of the nitrogen molecule ion.