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量子化学計算による星間分子の構造と化学反応の理論的予測

Research Project

Project/Area Number 04233103
Research Category

Grant-in-Aid for Scientific Research on Priority Areas

Allocation TypeSingle-year Grants
Research InstitutionOchanomizu University

Principal Investigator

平野 恒夫  お茶の水女子大学, 理学部, 教授 (40011027)

Co-Investigator(Kenkyū-buntansha) 生田 茂  東京都立大学, 教養部, 教授 (60112471)
山下 晃一  東京大学, 工学部, 助教授 (40175659)
長村 吉洋  立教大学, 理学部, 教授 (50160841)
田中 皓  電気通信大学, 電気通信学部, 教授 (00000860)
長嶋 雲兵  お茶の水女子大学, 理学部, 助教授 (90164417)
岩田 末廣  慶応大学, 理工学部, 教授 (20087505)
村上 明徳  三菱化成研究所, 研究員
Project Period (FY) 1994
Project Status Completed (Fiscal Year 1994)
Budget Amount *help
¥56,900,000 (Direct Cost: ¥56,900,000)
Fiscal Year 1994: ¥14,000,000 (Direct Cost: ¥14,000,000)
Fiscal Year 1993: ¥22,600,000 (Direct Cost: ¥22,600,000)
Fiscal Year 1992: ¥20,300,000 (Direct Cost: ¥20,300,000)
Keywords星間分子 / 量子化学計算 / 分子構造 / 化学反応 / ab initio分子軌道法 / 分子軌道法 / 電子状態 / 回転定数 / 量子化学 / FeCO / 解離性再結合反応:HCNH^++e^- / イオン分子反応 / 放射会合反応 / 位相空間統計理論 / リドベルグ状態 / 励起状態 / 理論計算
Research Abstract

平成5年度に引き続き、星間分子の構造と化学反応に関して以下の研究を行った。
1.我々が見い出したMgを含む星間分子としては最初の例であるMgNCに対して、さらに精度をあげたACPF/TZ2P+f法による電子状態の計算を行い、回転定数B_0の実測値5966.90MHzに対して、計算値5969.3MHzを得た。異性体のMgNCに対しても同様な計算を行い、実験値5094.80MHzに対して5089.3MHzの値を得た。また、星間分子候補として有力なFeCOの基底状態の分子構造をMRSDCI法で計算し、分光学定数を予測した。(平野)
2.新たに見い出されたCOの赤外領域での発光スペクトルをリドベルグ状態間の遷移として同定した。(平野、長嶋)
3.FeH,FeCOに関してf関数をも含む基底関数を用い、大規模なMRCIの計算を行った。また、MgC_2の構造と分光学定数をSDCIレベルで計算した。(田中)
4.解離性再結合反応HCNH^++e^-→の反応機構を検討し、炭素星周辺でHNC/HCN比が1に近いことを量子化学的に説明した。(平野、長嶋)
5.アセチレンシアニドHC_3Nの生成機構に関して、種々の中間体のエネルギーを計算して、C_2H_2またはC_2HとCNからの生成が可能であることを示した。(長村)
6.星間反応C(^3P)+C_2H_2→C_3H_2のポテンシャル面をCASSCF/DZPとMP4/6-31G^<**>法で求めた。また、cyclic-C_3H_2からlinear-C_3H_2への異性化反応過程と、cyclic-C_3H+Hへの解離過程がほぼ障壁なしに起こることを明らかにした。(山下)

Report

(3 results)
  • 1994 Annual Research Report
  • 1993 Annual Research Report
  • 1992 Annual Research Report
  • Research Products

    (46 results)

All Other

All Publications (46 results)

  • [Publications] Keisaku Ishii: "Ab initio study on low-lying vibrational states and spectroscopic constants of MgNC(X^2Σ^+)" J.Mol.Struct.(Theochem). 305. 117-125 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] Tsuneo Hirano: "Vibration Mixing in Terms of Normal Modes" J.Phys.Chem.98. 6936-6941 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] Tsuneo Hirano: "Vibration Mixing:An Application to the Prediction of the Transition Normal Vibration Mode" J.Phys.Chem.

    • Related Report
      1994 Annual Research Report
  • [Publications] Eriko Kagi: "Fourier Transform Infrared Spectroscopy of the A^1II-X^1Σ^+System of MgO" J.Mol.Spectroscopy. 168. 109-125 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] Tetsuya Taketsugu: "Mechanism of bifurcation along the reaction path:An application in the case of thioformaldehyde" J.Chem.Phys.99. 9806-9814 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] Tsuneo Hirano: "Potential enrgy surfaces and branching ratio of the dissociative recombination reaction HCNH^++e^-:An ab initio molecular orbital study" J.Chem.Phys.

    • Related Report
      1994 Annual Research Report
  • [Publications] J.Takahashi: "Ab initio Study on the Formation Mechanisms of the Interstellar Molecule C_3H" Astrophys.J. (発表予定).

    • Related Report
      1994 Annual Research Report
  • [Publications] Y.Osamura: "Molecular Orbital Study on the Formation Reactions of the Interstellar Molecules containing Carbons" (発表予定).

    • Related Report
      1994 Annual Research Report
  • [Publications] 福澤 薫: "星間空間における窒素を含む中性反応の理論的研究" (発表予定).

    • Related Report
      1994 Annual Research Report
  • [Publications] 田中 皓: "FeHの電子状態に関するab initio分子軌道法計算" (発表予定).

    • Related Report
      1994 Annual Research Report
  • [Publications] Y.Osamura: "Geometries and Electronic Structures of HC_nS(n=2-4)" (発表予定).

    • Related Report
      1994 Annual Research Report
  • [Publications] K.Aoki: "CASSCF and SDCI study of the possible structures of CH_3 ion and radical" J.Mol.Struct.(Theochem). (発表予定).

    • Related Report
      1994 Annual Research Report
  • [Publications] T.Taketsugu: "Mechanism of Bifurcation along the Reaction Path:An Application in the Case of Thioformaldehyde" J.Chem.Phys.99. 9806-9814 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] K.Ishii: "An ab initio Prediction of the Spectroscopic Constants of MgNC:The First Mg-Bearing Molecule Space" Astrophys.J.410. L43-L44 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] K.Ishii: "Ab initio study on low-lying vibrational states and spectroscopic constants of MgNC(X_2Σ^+)" J.Mol.Struct.(THEOCHEM). (1994)

    • Related Report
      1993 Annual Research Report
  • [Publications] K.Kawaguchi: "Laboratory spectroscopy of MgNC:The first radioastronomical identification of Mg-bearing molecule" Astrophys.J.406. L39-L42 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] T.Sakai: "A CSF based multi reference coupled pair approximation II-as a size consistent method in the scheme of multi reference singly and doubly excited configuration interaction" Theoret.Chim.Acta. 85. 451-461 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] K.Yamaguchi: "Comparison between spin restricted and unrestricted post Hartree-Fock calculations in Ising and Heisenberg model" Chem.Phys.Letters. 210. 201-210 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] H.Tatewaki: "Electronic structure of a Cluster taken from high-Tc superconductor of YBa_2Cu_3O_7:(Cu_4O_2)(O_4Ba)(Cu_4O_4)Ybededin ionic cage of point charges" Jpn.J.Appl.Phys.33. 92-96 (1994)

    • Related Report
      1993 Annual Research Report
  • [Publications] Y.Sonoda: "Molecular orbital study of the ion-molecule reactions producing the hydrocarbons in intersteller space" Bull.Chem.Soc.Japan. 66. 3345-3351 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] H.Watanabe: "Theoretical studies of the aluminium-water clusters Al(H_2O)_n and their ions[Al(H_2O)_n]^+" Bull.Chem.Soc.Japan. 66. 3245-3252 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] M.Hiyama: "Theoretical assignment of the vibronic bands in the photoelectron spectra of N_2 below 30 eV" Chem.Phys.Letter. 211. 319-327 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] K.Fuke: "Electronic structure and reactivity of Mg^+(H_2O)_n cluster ions" Z.Phys.D. 26S. 180-183 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] M.Hiyama: "Assignment of the Photoelectron Spectrum of HCl above 20 eV" Chem.Phys.Letter. 210. 187-192 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] E.Herbst: "Calculations of Intersteller Radiative Association Rates including Tunneling:The strange Case of C_2H_2++H_2" J.Chem.Soc.Faraday Trans. 89. 2175-2183 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] W.Gabriel: "Theoretical potential energy functions and rovibronic spectrum of SiH2(X^1A_1 and A^3B_1)" Chem.Phys.174. 45-56 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] S.A.Maluendas: "Calculation on the competition between Association and Reaction for C_3H^++H_2" J.Chem.Phys.99. 2812-2820 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] B.Weis: "Theoretical potential energy functions and rovibronic spectrum of electronically excited states of HCO^+" J.Chem.Phys.99. 9512-9520 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] K.Aoki: "Most stable isomer and singlet-triplet energy separation in the HC_4N molecule" Chem.Phys.Letter. 209. 211-215 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] Y.Kasai: "Laboratory Detection of C_5S by pulsed discharge-nozzle Fourier transform microwave spectroscopy" Astrophys.J.410. L45-L47 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] K.Kawaguchi,E.Kagi,T.Hirano,S.Takano,and S.Saito: "Laboratory spectroscopy of MgNC:The first radioastro-nomical identification of Mg-bearing molecule." Astrophys.J. 406. L39-42 (1993)

    • Related Report
      1992 Annual Research Report
  • [Publications] K.Ishii,T.Hirano,U.Nagashima,B.Weis,and K.Yamashita: "An ab initio prediction of the spectroscopic constants of MgNC: The first Mg-bearing molecule in space." Astrophys.J. 406. (1993)

    • Related Report
      1992 Annual Research Report
  • [Publications] K.Ishii,T.Hirano,U.Nagashima,B.Weis,and K.Yamashita: "Ab initio calculations of low-lying vibrational states and spectroscopic constants of MgNC" J.Phys.Chem.

    • Related Report
      1992 Annual Research Report
  • [Publications] TSakai and K.Tanaka: "A CSF Multi Reference Coupled pair Approximation II.As a Size Consistent Method in the Multi Reference Singly and Doubly Excited Configuration Interaction" Theore.Chem.Acta.

    • Related Report
      1992 Annual Research Report
  • [Publications] S.Nanbu,T.Kondow,and S.Iwata: "Potential Energy Surfaces of Some Low-Lying States of Fluoroformyl Radical FCO" Chem.Phys.(1993)

    • Related Report
      1992 Annual Research Report
  • [Publications] T.Ikegami,T.Kondow,and S.Iwata: "The geometric and electronic structures of Arn+(n=3-27)." J.Chem.Phys.(1993)

    • Related Report
      1992 Annual Research Report
  • [Publications] F.Misaizu,M.Sanekata,K.Tsukamoto,K.Fuke,and S.Iwata: "Photodissociation of size-selected Mg^+(H_2O)n ions for n= 1 and n = 2" J.Phys.Chem.96. 8259-8264 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] H.Matsunaga,T.Hanawa,K.Suzuki,and S.Iwata: "Theoretical study of Aluminum-Sodium bimetallic cluster I: Geometrical and eletronic structures of AlnNA(n=1-4)" Bull.Chem.Soc.Jpn.65. 2578-2588 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] K.Fan and S.Iwata: "Theoretical studies of new radicals SiNNH and SiCOH" Chem.Phys.Lett.195. 475-481 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] M.Hiyama,S.Nanbu,and S.Iwata: "The excimer emission spectra and the interaction potential energy of the ground and excited states of He and metal ion systems." Chem.Pheys.Lett.192. 443-450 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] S.Nanbu and S.Iwata: "Theoretical study of the photodissociation cross sections and the photodissociation dynamics of HOCl" J.Pheys.Chem.96. 2103-2111 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] K.Fan and S.Iwata: "Theoretical study on the three isomers of the SiNO radical" Chem.Phys.Lett. 189. 401-407 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] J.Irisawa and S.Iwata: "Ab initio studies of the low-lying states of BeO" Theor.Chem.Acta. 81. 223-235 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] K.Yamashita and E.Herbst: "Calculations on the rate of the ion-molecule reaction C_2H_2+H_2→C_2H_3+H"

    • Related Report
      1992 Annual Research Report
  • [Publications] K.Kawaguchi,S.Takano,M.Oishi,S.Ishikawa,K.Miyazawa,N.Kaifu,et al.: "Detection of HNCCC in TMC-1" Ap.J. 396. L49-51 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] E.Herbst and K.Yamashita: "Calculations of interstellar Radiative association rates including tunneling:The strange case of C_2H_2" Faraday Trans.89. (1993)

    • Related Report
      1992 Annual Research Report

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Published: 1992-04-01   Modified: 2016-04-21  

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