Amano Takayoshi
Institute for Astrophysics and Planetary Sciences, Ibaraki University, 2-1-1 Bunkyo, Mito 310-8512, Japan.
Philos Trans A Math Phys Eng Sci. 2006 Nov 15;364(1848):2943-52. doi: 10.1098/rsta.2006.1861.
We discuss past and recent progress of our continuing project of submillimetre-wave spectroscopic investigations of H2D+ and D2H+. Three new lines of H2D+ in the 2.5-3.5 THz range are measured with a tunable far-infrared laser system. Since these molecules are very light asymmetric molecules, analysis based on a conventional effective Hamiltonian is not very useful in predicting the transition frequencies to the accuracy of the order of several MHz or better. In this respect, any addition of new accurate measurements of transition frequencies is important. In this paper, some discussions will be made on H5+ and its deuterated species as probable interstellar species in cold dark clouds. In particular, D3+, which is predicted to be abundant in cold dark clouds, can be (indirectly) detected by observing D3+ x H2.
我们讨论了我们正在进行的关于H₂D⁺和D₂H⁺的亚毫米波光谱研究项目的过去和近期进展。使用可调谐远红外激光系统测量了2.5 - 3.5太赫兹范围内H₂D⁺的三条新谱线。由于这些分子是非常轻的不对称分子，基于传统有效哈密顿量的分析对于将跃迁频率预测到几兆赫兹或更高精度并不是非常有用。在这方面，任何新的精确跃迁频率测量的补充都是很重要的。在本文中，将对H₅⁺及其氘化物种作为冷暗云中可能的星际物种进行一些讨论。特别是，预计在冷暗云中含量丰富的D₃⁺可以通过观测D₃⁺×H₂（间接）检测到。
