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

To clarify the authenticity of a recently proposed identification of H2CCC(linear-C3H2) as a diffuse interstellar band carrier, we searched for therotational transition of H2CCC at a frequency of 103 GHz toward HD 183143 usinga 45-m telescope at the Nobeyama Radio Observatory. Although rms noise levelsof 32 mK in the antenna temperature were achieved, detection of H2CCC wasunsuccessful, producing a 3 sigma upper limit corresponding to a column densityof 2.0 \times 1013 cm-2. The upper limit indicates that the contribution ofH2CCC to the diffuse interstellar band at 5450 {\AA} is less than 1/25; thus,it is unlikely that the laboratory bands of the B1B1-X1A1 transition of H2CCCand the diffuse interstellar bands at 5450 {\AA} (and also 4881 {\AA}) towardHD 183143 are related.

Radio Search for H2CCC toward HD 183143 as a Candidate for a Diffuse Interstellar Band Carrier