Welcome to ExoMolHR

Empirical High-Resolution Molecular Spectrum Database and Calculator

ExoMolHR is an advanced platform delivering empirically refined high-resolution spectral data. Built upon the rigorous MARVEL procedure and the comprehensive ExoMol project, we provide precise line positions and computed intensities specifically curated and tailored for your high-resolution research needs.

Data quality thresholds
Energy uncertainty ΔE ≤ 0.05 cm-1
Resolving power R > 100 000
High Accuracy

Empirical energy levels with rigorous uncertainty quantification ensuring top-tier spectral fidelity.

Dynamic Calculation

Generate spectra on-the-fly for custom wavenumber/wavelength ranges, thermodynamic temperatures, and intensity thresholds.

Online Spectrum Plotting

Interactively visualize and plot stick spectra for mixed molecules and isotopologues directly in your browser.

Seamless Integration

Direct data export and seamless compatibility with the PyExoCross Python package for comprehensive offline analysis.

Data Statistics

45
Molecules
105
Isotopologues
1,067,070,512
Total Spectral Lines
Live usage

Downloads

10,035
Downloaded files

These statistics represent the current data within ExoMolHR. We continuously expand and update our collection in tandem with the latest releases from the main ExoMol database.

Recent Updates

2026 08 Jun

Update SO and add 3 molecules CO, KH, and NO+

2026 05 Jun

Count live usage

2026 18 May

New ExoMolHR release: 42 molecules and 100 isotopologues

2026 15 May

New file format: addition of resolving power R 🔥 HOT

2026 09 Apr

New API Reference Page Launched

2026 13 Mar

Major UI Overhaul and New Features Added! 🔥 HOT

2025 10 Oct

Update NH3 and add 2 molecules C3, ScO

2025 26 Sep

Add 4 molecules CaOH, H2CS, N2O, and VO

2025 25 Sep

Update CN, CH4 and add 4 molecules CH+, N2, NiH, and OH

2025 05 Feb

ExoMolHR paper has been published! "ExoMolHR: A Relational Database of Empirical High-resolution Molecular Spectra" Zhang et al. 2025 🔥 HOT

ExoMolHR uses ExoMol data supported by ERC Advanced Investigator Projects 267219 and 883830