Discovery of two new magnesium-bearing species in IRC+10216: MgC₃N and MgC₄H.

ABSTRACT: We report on the detection of two series of harmonically related doublets in IRC +10216. From the observed frequencies, the rotational constant of the first series is B = 1380.888 MHz and that of the second series is B = 1381.512 MHz. The two series correspond to two species with a ²Σ electronic ground state. After considering all possible candidates, and based on quantum chemical calculations, the first series is assigned to MgC₃N and the second to MgC₄H. For the latter species, optical spectroscopy measurements support its identification. Unlike diatomic metal-containing molecules, the line profiles of the two new molecules indicate that they are formed in the outer layers of the envelope, as occurs for MgNC and other polyatomic metal-cyanid

SUBMITTER: Cernicharo J 

PROVIDER: S-EPMC6774763 | biostudies-literature | 2019 Oct

REPOSITORIES: biostudies-literature