McCall B J, Hinkle K H, Geballe T R, Oka T
Department of Astronomy and Astrophysics, University of Chicago, IL 60637, USA.
Faraday Discuss. 1998(109):267-80. doi: 10.1039/a800655e.
Interstellar H3+ has been detected in dense as well as diffuse clouds using three 3.7 microns infrared spectral lines of the nu 2 fundamental band. Column densities of H3+ from (1.7-5.5) x 10(14) cm-2 have been measured in dense clouds in absorption against the infrared continua of the deeply embedded young stellar objects GL2136, W33A, MonR2 IRS 3, GL961E, and GL2591. Strong and broad H3+ absorptions have been detected in dense and diffuse clouds towards GC IRS 3 and GCS3-2 in the region of the galactic center. A large column density of H3+, comparable to that of a dense cloud, has been detected towards the visible star Cygnus OB2 No. 12, which has a line of sight that crosses mostly diffuse clouds. The H3+ chemistry of dense and diffuse clouds are discussed using a very simple model. Some future projects and problems are discussed.
利用ν2基频带的三条3.7微米红外光谱线，在致密云以及弥漫云中检测到了星际H₃⁺。在致密云中，针对深度嵌入的年轻恒星天体GL2136、W33A、麒麟座R2 IRS 3、GL961E和GL2591的红外连续体，已测量出H₃⁺的柱密度为(1.7 - 5.5)×10¹⁴厘米⁻²。在朝向银河系中心区域的GC IRS 3和GCS3 - 2的致密云和弥漫云中，检测到了强烈而宽广的H₃⁺吸收。在可见恒星天鹅座OB2 No. 12方向检测到了与致密云相当的大H₃⁺柱密度，其视线主要穿过弥漫云。使用一个非常简单的模型讨论了致密云和弥漫云的H₃⁺化学。还讨论了一些未来的项目和问题。
