title: Search for H2COH+ and H2(13)CO in dense interstellar molecular clouds.
abstract: We have searched for the 2 mm transitions of H2COH+ (2(02) - 1(01)) and H2(13)CO (2(02) - 1(01), 2(12) - 1(11), and 2(11) - 1(10)) toward the dense interstellar molecular clouds Orion A, TMC-1 and L134N using the FCRAO 14m telescope. None of the transitions have been detected except the H2(13)CO transitions toward Orion-KL. We set upper limits for the abundances of the protonated formaldehyde ion (H2COH+), which are close to the abundances expected from ion-molecule chemistry.
authors.affiliation: Korea Astronomy Observatory, Hwaam, Yusong.
authors.forename: Y C
authors.initials: YC
authors.lastname: Minh
authors.forename: W M
authors.initials: WM
authors.lastname: Irvine
authors.forename: D
authors.initials: D
authors.lastname: McGonagle
mesh_terms: D055580:Astronomical Phenomena; D001256:Astronomy; D002247:Carbon Isotopes; D005118:Extraterrestrial Environment; D005557:Formaldehyde / Q000032:analysis / Q000737:chemistry*; D013057:Spectrum Analysis
chemical_list: D002247:Carbon Isotopes; D005557:Formaldehyde