http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Bilirubin 분자이온의 이단계 질량 분석법적 연구 : Tandem mass spectrometry of bilirubin molecularion
崔重哲 水原大學校 1992 論文集 Vol.10 No.-
Bilirubin 분자이온의 준안정 분해를 조사하기 위해 B/E scan 및 B²/E scan을 사용하는 이단계 질량분석 연구를 하였다. 고분별능 질량분석 결과 대부분의 토막이온이 이성질체를 갖는 것으로 드러났다. 이단계 질량분석과 고분별능 질량분석 결과로 부터 분자이온의 분해 경로가 결정되었다. m/z 288,299,300 이온이 준안정 분해의 주요한 중간이온임을 알 수 있었다. Tandem mass spectrometry(MS/MS) of the bilirubin molecular ion has been studied using B/E and B²/E linked scans for the investigation of metastable ion decomposition. Most of the fragment ions have been found to have some isomers as a result of high resolution mass spectrometry(HRMS). Fragmentation pathways of the molecular ion have been determined from the MS/MS and HRMS data together with ionic structures. M/z 288, 299 and 300 ions have been found to play important roles as intermediate ions in the metastable ion decomposition of the molecular ion.
상공간 이론을 활용한 이온 분해의 운동에너지 방출 분포 계산
최중철 수원대학교 기초과학연구소 1997 基礎科學論文集 Vol.6 No.-
Calculation method for kinetic energy release distribution in ion dissociation has been described using phase space theory. Phase space theory is known to be adequate to explain the product energy disposal in ion dissociation occurring without a considerable reverse barrier. Calculated results of kinetic energy release distributions for some ion dissociations are compared with the experimental ones and its meaning is to be discussed.
Decarbonylation of the 2-Hydroxypyridine Radical Cation: A Computational Study
최중철 대한화학회 2014 Bulletin of the Korean Chemical Society Vol.35 No.10
The potential energy surface (PES) for the dissociation of the 2-hydroxypyridine (2-HP) radical cation was determined from G3//B3LYP calculations, including the loss of CO, HCN, and HNC. The formation of the 1Hpyrrole radical cation by decarbonylation through a more stable tautomer, the 2-pyridone (2-PY) radical cation, was the most favorable dissociation pathway. Kinetic analysis by the Rice-Ramsperger-Kassel-Marcus model calculations was carried out based on the obtained PES. It is proposed that the dissociation occurs after a rapid tautomerization to 2-PY•+, and that most of the ions generated by ionization of 2-HP have the structure of 2- PY•+ at equilibrium above the tautomerization barrier.
최중철 수원대학교 자연과학연구소 1999 자연과학논문집 Vol.2 No.-
The effect of the long-range potential in simple bond cleavage reactions of the polyatomic molecular systems has been investigated. The centrifugal barrier can reduce phase spaces of the products. The reduced mass and the polarizability of the neutral product(s) have been found to be important for the centrifugal barrier. The previous observations of the large kinetic energy releases in the H atom loss reactions without considerabie reverse barriers are likely to be due to their high centrifugal barriers in the long range.
Does the Gaseous Aniline Cation Isomerize to Methylpyridine Cations Before Dissociation?
최중철 대한화학회 2013 Bulletin of the Korean Chemical Society Vol.34 No.11
We have explored the potential energy surface for the isomerization of the aniline (AN) radical cation to the 2-, 3-, and 4-methylpyridine (picoline, MP) radical cations using G3 model calculations. The isomerization may occur through the 1H-azepine (7-aza-cycloheptatriene) radical cation. A quantitative kinetic analysis has been performed using the Rice-Ramsperger-Kassel-Marcus theory, based on the potential energy surface. The result shows that isomerization between AN+• and each MP+• hardly occurs before their dissociations.