Molecular Emission Line Tool (MELT)

About This Tool

Original Source: This tool is based on the comprehensive molecular spectroscopy data from "The Identification of Molecular Spectra" by Pearse, R. W. B., & Gaydon, A. G. (1976), published by Chapman and Hall.

Open Source: This is an open-source web tool designed to make molecular line identification more efficient than manually examining the original book. You can visit our GitHub repository to download everything or contribute to the project. I am still working on proofreading of the database (there is a lot of work), so a contribution is very welcome!

Purpose: This tool allows astronomers and laboratory spectroscopists to quickly filter and identify molecular emission lines. Users can filter elements and wavelength (frequency) range. For atomic emission lines, there is already a fantastic database the NIST Atomic Spectra Database, and a visualization platform the NIST LIBS Database

New Feature - Spectrum Visualization: You can now select multiple emission lines and generate an interactive example spectrum!

How to use: Enter the range of the line (or line group) you observed (a very small range is preferred), and choose the possible elements, click "Search Emission Lines". To generate a spectrum, check the boxes next to desired lines and click "Generate Spectrum". Adjust the peak width to simulate different instrumental resolutions. Please note that the intensity is relative, it is only comparable within the same system of a molecule/ion.