# ASTROROT

Full Name
Unraveling interstellar chemistry with broadband microwave spectroscopy and next-generation telescope arrays

Start Date:
2015-05-01

End Date:
2020-04-30

Duration:
60 Monate

Grant Agreement No. / Project Reference No.
638027

>Project Website
pubdb

The goal of the research program, ASTROROT, is to significantly advance the knowledge of astrochemistry by exploring its molecular complexity and by discovering new molecule classes and key chemical processes in space. So far, mostly physical reasons were investigated for the observed variations in molecular abundances. We here propose to study the influence of chemistry on the molecular composition of the universe by combining unprecedentedly high-quality laboratory spectroscopy and pioneering telescope observations. Array telescopes provide new observations of rotational molecular emission, leading to an urgent need for microwave spectroscopic data of exotic molecules. We will use newly developed, unique broadband microwave spectrometers with the cold conditions of a molecular jet and the higher temperatures of a waveguide to mimic different interstellar conditions. Their key advantages are accurate transition intensities, tremendously reduced measurement times, and unique mixture compatibility.
Our laboratory experiments will motivate and guide astronomic observations, and enable their interpretation. The expected results are

• the exploration of molecular complexity by discovering new classes of molecules in space,
• the detection of isotopologues that provide information about the stage of chemical evolution,
• the generation of abundance maps of highly excited molecules to learn about their environment,
• the identification of key intermediates in astrochemical reactions.

The results will significantly foster and likely revolutionize our understanding of astrochemistry. The proposed research will go far beyond the state-of-the-art: We will use cutting-edge techniques both in the laboratory and at the telescope to greatly improve and speed the process of identifying molecular fingerprints. These techniques now enable studies at this important frontier of physics and chemistry that previously would have been prohibitively time-consuming or even impossible.

DESY Participation

Contact at DESY
melanie.schnell(at)DESY.de

## Journal publications with direct DESY contribution

Chirped-pulse Fourier transform millimeter-wave spectroscopy of ten vibrationally excited states of i-propyl cyanide: exploring the far-infrared region
Physical chemistry, chemical physics 19(3), 1751 - 1756 () [10.1039/C6CP06297K]     Files BibTeX | EndNote: XML, Text | RIS

Capturing the Elusive Water Trimer from the Stepwise Growth of Water on the Surface of the Polycyclic Aromatic Hydrocarbon Acenaphthene
The journal of physical chemistry letters 8(23), 5744 - 5750 () [10.1021/acs.jpclett.7b02695]     Files BibTeX | EndNote: XML, Text | RIS

Where's water? The many binding sites of hydantoin
Physical chemistry, chemical physics 20(8), 5545 - 5552 () [10.1039/C7CP06518C]     Files BibTeX | EndNote: XML, Text | RIS

Microwave spectra and nuclear quadrupole structure of the $NH_{3}–N_{2}$ van der Waals complex and its deuterated isotopologues
The journal of chemical physics 149(22), 224305 () [10.1063/1.5063346]     Files BibTeX | EndNote: XML, Text | RIS

The structural determination and skeletal ring modes of tetrahydropyran
Physical chemistry, chemical physics 21(6), 3016 - 3023 () [10.1039/C8CP06204H]     Files BibTeX | EndNote: XML, Text | RIS

Far-IR and UV spectral signatures of controlled complexation and microhydration of the polycyclic aromatic hydrocarbon acenaphthene
Physical chemistry, chemical physics 21(7), 3414 - 3422 () [10.1039/C8CP04480E]     Files BibTeX | EndNote: XML, Text | RIS

## Journal publications by project partners

A global study of the conformers of 1,2-propanediol and new vibrationally excited states
Journal of molecular spectroscopy 337, 9 - 16 () [10.1016/j.jms.2017.02.017]     Files BibTeX | EndNote: XML, Text | RIS

Corannulene and its complex with water: a tiny cup of water
Physical chemistry, chemical physics 19(22), 14214 - 14223 () [10.1039/C7CP01506B]     Files BibTeX | EndNote: XML, Text | RIS