High-resolution Fourier-transform XUV photoabsorption spectroscopy of 14N15N

TL;DR

This study presents the first high-resolution XUV photoabsorption spectrum of 14N15N, providing detailed experimental data that verifies a theoretical model of N2's photoabsorption and photodissociation processes.

Contribution

It offers the first comprehensive high-resolution spectrum of 14N15N and confirms theoretical predictions about its photoabsorption behavior and isotopomer-dependent properties.

Findings

Observed 25 absorption bands with assigned transition energies, f values, and linewidths.

Verified mass-dependent predissociation linewidths and oscillator strengths.

Detected local perturbations within rotational series.

Abstract

The first comprehensive high-resolution photoabsorption spectrum of 14N15N has been recorded using the Fourier-transform spectrometer attached to the Desirs beamline at the Soleil synchrotron. Observations are made in the extreme ultraviolet (XUV) and span 100,000-109,000 cm-1 (100-91.7 nm). The observed absorption lines have been assigned to 25 bands and reduced to a set of transition energies, f values, and linewidths. This analysis has verified the predictions of a theoretical model of N2 that simulates its photoabsorption and photodissociation cross section by solution of an isotopomer independent formulation of the coupled-channel Schroedinger equation. The mass dependence of predissociation linewidths and oscillator strengths is clearly evident and many local perturbations of transition energies, strengths, and widths within individual rotational series have been observed.