Project A4

Project leaders: Schlemmer, Stephan (PH1); Thorwirth, Sven (PH1); Lewen, Frank (PH1)

It is the purpose of the sub-project to record rotational spectra of molecules which are abundant in the interstellar medium (ISM) and to investigate collisional excitation processes by new laboratory methods. One focus lies on recording the rotational spectra of vibrationally excited species. Comparing the intensities of these bands to those of ground state species will serve as tracers for the energetic state of the various habitats of high-mass star formation. The other focus lies on the development of spectroscopic tools to investigate the collisional excitation/de-excitation of such vibrational states. Both aspects are important for the interpretation of respective astrophysical observations and as input for the respective modeling of synthetic spectra.

Publications

@article{2024JQSRT.31908962Ub,

title = {Submillimeter wave spectrum of methylene chloride, ^{12}CH_{2}^{35}Cl_{2}, ^{12}CH_{2}, ^{35}Cl^{37}Cl and ^{12}CH_{2}^{37}Cl_{2} up to 1.1 THz},

author = {O. N. Ulenikov and O. V. Gromova and E. S. Bekhtereva and H. S. P. Müller and L. Margulès},

doi = {10.1016/j.jqsrt.2024.108962},

year  = {2024},

date = {2024-06-01},

urldate = {2024-06-01},

journal = {Journal of Quantitiative Spectroscopy and Radiative Transfer},

volume = {319},

pages = {108962},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2023A&A...680A..25Fb,

title = {Millimetre and submillimetre spectroscopy of isobutene and its detection in the molecular cloud G+0.693},

author = {Mariyam Fatima and Holger S. P. Müller and Oliver Zingsheim and Frank Lewen and Víctor M. Rivilla and Izaskun Jiménez-Serra and Jesús Martín-Pintado and Stephan Schlemmer},

doi = {10.1051/0004-6361/202347112},

year  = {2023},

date = {2023-12-01},

urldate = {2023-12-01},

journal = {Astronomy & Astrophysics},

volume = {680},

pages = {A25},

key = {A4},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2023JMoSp.39811840B,

title = {Ro-vibrational spectra of Csbnd C stretching modes of C_{3}H^{+} and HC_{3}O^{+}},

author = {Marcel Bast and Julian Böing and Thomas Salomon and Sven Thorwirth and Oskar Asvany and Mathias Schäfer and Stephan Schlemmer},

doi = {10.1016/j.jms.2023.111840},

year  = {2023},

date = {2023-11-01},

urldate = {2023-11-01},

journal = {Journal of Molecular Spectroscopy},

volume = {398},

pages = {111840},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

References

1. Endres, Caselli, and Schlemmer, “State-to-state rate coefficients for NH3–NH3 collisions from pump–- probe chirped pulse experiments”, J. Phys. Chem. Lett. 10, 4836 (2019).
2. Endres, Martin-Drumel, Zingsheim, Bonah, Pirali, Zhang, Sánchez-Monge, Möller, et al., “SOLEIL and ALMA views on prototypical organic nitriles: C2H5CN”, J. Mol. Spectrosc. 375, 111392 (2021).
3. Endres, Schlemmer, Schilke, Stutzki, and Müller, “The Cologne Database for Molecular Spectroscopy, CDMS, in the Virtual Atomic and Molecular Data Centre, VAMDC”, J. Mol. Spectrosc. 327, 95 (2016).
4. Hermanns, Wehres, Lewen, Müller, and Schlemmer, “Rotational spectroscopy of the two higher energyconformers of 2-cyanobutane”, J. Mol. Spectrosc. 358, 25 (2019).
5. Liu, Walters, Wehres, Lewen, Schlemmer, and Müller, “Rotational rest frequencies of the low lyingvibrational states of n-propyl cyanide from extensive laboratory measurements up to 506 GHz”, A&A622, A82 (2019).
6. Martin-Drumel, Endres, Zingsheim, Salomon, Wijngaarden, Pirali, Gruet, Lewen, et al., “The SOLEILview on sulfur rich oxides: the S2O bending mode ⌫2 at 380 cm1 and its analysis using an AutomatedSpectral Assignment Procedure (ASAP)”, J. Mol. Spectrosc. 315, 72 (2015).
7. Müller, Belloche, Lewen, Drouin, Sung, Garrod, and Menten, “Toward a global model of the interactions in low-lying states of methyl cyanide: rotational and rovibrational spectroscopy of the v4 = 1 state and tentative interstellar detection of the v4 = v8 = 1 state in Sgr B2(N)”, J. Mol. Spectrosc. 378, 111449(2021).
8. Wehres, Maßen, Borisov, Schmidt, Lewen, Graf, Honingh, Higgins, et al., “A laboratory heterodyneemission spectrometer at submillimeter wavelengths”, Phys. Chem. Chem. Phys. 20, 5530 (2018).
9. Xu, Lees, Zakharenko, Müller, Lewen, Schlemmer, and Menten, “Millimeter-wave spectroscopy of the13CH3OD isotopic species of methyl alcohol”, J. Mol. Spectrosc. 378, 111473 (2021).
10. Zingsheim, Bonah, Lewen, Thorwirth, Mueller, and Schlemmer, “Millimeter-millimeter-wave double-modulation double-resonance spectroscopy”, J. Mol. Spectrosc. 381, 111519 (2021).