A replacement of the Lorentz law for the shape of the spectral lines in the infrared region

TL;DR

This paper introduces a new phenomenological law to model the spectral line shapes in the infrared, capturing the exponential decay of the extinction coefficient at high frequencies, and demonstrates its effectiveness on various mineral spectra.

Contribution

The paper proposes a novel phenomenological law for infrared spectral lines that better accounts for high-frequency decay, improving spectral modeling accuracy.

Findings

Good agreement with measured spectra of LiF, NaCl, MgF2

Accurately models exponential decay of extinction coefficient

Applicable over a wide frequency range

Abstract

We propose a new phenomenological law for the shape of the spectral lines in the infrared, which accounts for the exponential decay of the extinction coefficient in the high frequency region, observed in many spectra. We apply this law to the measured infrared spectra of LiF, NaCl and MgF$_2$, finding a good agreement, over a wide range of frequencies.