English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Laboratory measurements and analysis of the microwave and millimeter-wave spectra of potential interstellar moleculesare a prerequisite for their subsequent identification by radioastronomical techniques. The spectral analysis provides spectroscopicparameters that are used in the assignment procedure of the laboratory spectra, and that also predict the frequencies of transitions notmeasured in the laboratory with a high degree of precision.Aims. An experimental laboratory study and its theoretical analysis is presented for 13C2-methyl formate (HCOO13CH3) allowing asearch for this isotopologue in the Orion molecular cloud. The 13C1-methyl formate (H13COOCH3) molecule was also searched forin this interstellar cloud, using previously published spectroscopic data.Methods. The experimental spectra of 13C2-methyl formate were recorded in the microwave and sub-mm energy ranges (4–20 GHz,8–80 GHz, 150–700 GHz). The spectra were analyzed using the Rho-Axis Method (RAM), which takes the CH3 internal rotation andthe coupling between internal rotation and global rotation into account.Results. Twenty-seven spectroscopic constants of 13C2-methyl formate have been obtained from a fit of 936 transitions of the groundtorsional state with a standard (unitless) deviation of 1.08. A prediction of line positions and intensities is also produced. This predictionallowed us to identify 230 13C2-methyl formate lines in the Orion interstellar molecular cloud.We refitted all previously publishedground state transitions of the 13C1-methyl formate molecule in order to provide a prediction of its ground state spectrum. 234 linesof 13C1-methyl formate were detected in the Orion interstellar cloud using that prediction

astronomy and astrophysics

Rotational spectrum of13C2-methyl formate (HCOO13CH3) and detection of the two13C-methyl formate in Orion