Submillimeter-Wave(400-700 GHz) Sources and Spectroscopy of the H_2D^+Ion

H_2D^ 离子的亚毫米波（400-700 GHz）源和光谱

• 批准号: 62470015
• 负责人: SAITO Shuji
• 金额: $ 4.29万
• 依托单位: Nagoya University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (B)
• 财政年份: 1987
• 资助国家: 日本
• 起止时间: 1987 至 1989
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-62470015/
• 关键词: Microwave spectroscopy; Transient molecule; Interstellar molecule; Free radical; Radio telescope; Unidentified interstellar line; Millimeter-wave Spectroscopy; Submillimeter-wave spectroscopy; フリーラジカル; 電波望遠鏡星間分子; 星間化学; ミリ波; 分子イオン

We constructed doublers and triplers from a combination of millimeter wave klystrons and nonlinear mixers (GaAs Schottky diode), aiming to obtain the radiation power at 400-700 GHz suitable for spectroscopy of the submillimeter-wave transitions of the H_2D^+ion. However, the output power generated from the tripler constructed was too low in power to carry out spectroscopy in the submillimeter-wave region. We have tried to improve the tripler to give a higher output power. A quadrupler giving the output power in the frequency region above 400 GHz is planned in the coming year.We have studied several transient molecules, especially potential candidates for interstellar molecules by using the high-sensitivity millimeter and submillimeter-wave spectrometer combined with the multipliers developed in the Research Project.. We identified four new interstellar molecules, CH_2CN(^2B_1), cyclic-C_3H(^2B_2), CP(^2SIGMA^+), and C_4Si, mainly on the basis of the laboratory spectroscopic results. We also studied several new molecules such as PS(2PI_r), MgS, CaS, AlS(^2SIGMA^+). FeS(^5DELTA_i), NH_2O(^2B_1), ND_2(^2B_2), and HSiS(^2A'), and determined their detailed molecular constants with high precision.

我们将毫米波速调管和非线性混频器（GaAs肖特基二极管）组合在一起，构建了倍频和三倍频器，旨在获得400-700 GHz的辐射功率，适合于H_2D^+离子的亚毫米波跃迁光谱。然而，所构建的三倍器产生的输出功率太低，无法在亚毫米波区域进行光谱分析。我们已设法改进三倍器以提供更高的输出功率。一种四倍器的输出功率在400千兆赫以上的频率区域，计划在明年。我们利用高灵敏度毫米波和亚毫米波光谱仪结合研究项目开发的乘法器，研究了几种瞬态分子，特别是星际分子的潜在候选者。我们主要根据实验室光谱结果鉴定出了4个新的星际分子：CH_2CN（^2B_1）、环c_3h （^2B_2）、CP（^2SIGMA^+）和C_4Si。我们还研究了一些新的分子，如PS(2PI_r), MgS, CaS, AlS（^2SIGMA^+）。FeS(^5DELTA_i), NH_2O(^2B_1), ND_2（^2B_2）和hsi (^2A')，并高精度地测定了它们的详细分子常数。

项目成果

S.Saito: "The Microwave Spectrum of the CP Radical and Related Astronomical Search" Astrophys.J.341. 1114-1119 (1989)

S.Saito：“CP 自由基和相关天文搜索的微波频谱”Astrophys.J.341。

S. Saito et al.: "The Microwave Spectrum of the CP Radical and Related Astronomical Search" Astrophys. J., 341, 1114-1119 (1989).

S. Saito 等人：“CP 自由基和相关天文搜索的微波频谱”天体。

S. Saito et al.: "Laboratory Detection of a New Interstellar Free Radical CH_2CN(^2B_1)" Astrophys. J., 334, L113-L116 (1988).

S. Saito 等人：“实验室检测新的星际自由基 CH_2CN(^2B_1)”天体。

S. Saito: "Laboratory Microwave Spectroscopy of Interstellar Molecules" Appl. Spectrosc. Rev., (1990).

S. Saito：“星际分子的实验室微波光谱”应用。

S.Takano: "Millimetr Wave Spectra of MgS and CaS" Chem.Phys.Letters. 159. 563-566 (1989)

S.Takano：“MgS 和 CaS 的毫米波光谱”《化学物理快报》。