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The detection of the nitrogen sulfide cation (NS+) was reported in early 2018 by
Cernicharo and co-workers. The new molecule
was observed with the IRAM 30m telescope
toward a wide variety of sources, including prestellar cores such as
Barnard 1b (B1b),
cold molecular clouds such as
Serpens South 1a,
and shocks such as
L1157-B1.
NS+ was notably not detected toward Orion-KL or IRC +10216, two very rich molecular
sources. New laboratory measurements of the rotational spectrum of NS+ confirmed the identification.
NS+ was subsequently detected along with 12 other sulfur-containing compounds by
Riviere-Marchalar et al toward the
Horsehead
nebula, a photodissociation region (PDR).
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