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The 27 ^th Colloquium on High-Resolution Molecular Spectroscopy (HRMS) was initially planned on-site. Due to the Covid-19 pandemic, the event will be held for the first time as an online conference to fulfill the regulations of the government and to facilitate safe exchange of scientific information.

There will be 11 invited lectures and 3 mini-symposia. Parallel sessions will feature 54 contributed lectures given by PhD students and postdocs. 4 poster sessions are planned. The scientific fields covered are:

• High resolution rotational, vibrational, and electronic spectroscopy of molecules (radicals, ions, complexes, clusters, ...)
• Molecular dynamics
• Theory assisting the prediction, simulation, and interpretation of spectra
• New techniques for high-resolution spectroscopy
• Applications to atmospheric sciences, astrophysics, planetology, combustion, gas-phase biomolecules, metrology and fundamental physics, cold molecules, etc.

As in previous years, there will be a special issue of the journal "Molecular Physics" published to mark the HRMS 2021 conference and to celebrate the 75^th birthday of Dr. Jean-Marie Flaud.  All participants of the conference are invited to contribute a paper.
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