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곽현태(Kwak Hyon Tae) 국민대학교 교육연구소 1982 교육논총 Vol.1 No.-
The theoretical approach to thermodynamic properties of the adsorbed layer is founded by the statistical thermodynamics. It is assumed that the adsorbed layer possesses the degrees of freedom both of the gas-like and the solid-like. The gas-like phase is described as an ideal gas and the solid-like phase as an Einstein oscillator. Molecular aspects of the parameters are averaged out to molar quantities i.e. E₁ and E<SUB>n</SUB>. Discontinuity of entropies of the adsorption reveal the evidences of the first order phase transition in the adsorbed layer. Heat capacities from the partition function formulated here are also the another pieces of the l-st order one. It is convinced that adsorption phenomena could be explained as 2-dimensional liquid in this work.
열탈착 분석법에 의한 Pt(111) 표면위의 NO와 CO의 흡착
이순보,박종윤,곽현태,부진효,강용철 성균관대학교 1992 論文集 Vol.42 No.2
The adsorptions of nitric oxide and carbon monoxide on Pt(111) surfaces have been studied by using LEED, AES, and TDS(Thermal Desorption spectroscopy). The adsorbed species of NO is predominantly molecular on the Pt(111) surface at room temperature. A main desorption peak of TDS is attributed to the molecular adsorption at 360K. With increasing No exposures, a shoulder peak at 480K which may be attributed to the defect site adsorption is appeared. The desorption rate order for No desorption is 1st order and the desorption energy for NO calculated by Redhead equation assuming pre-exponential factor v_1=10^13 sec^-1 is 21.7Kcal/mol. The adsorption of carbon monoxide is also molecular on Pt(111) surface at room temperature. The TDS results showed only a single broad peak at 460K, which is attributed to molecular adsorption. The desorption order for CO desorption is 1st order as well as NO and the desorption energy for CO is 28Kcal/mol.
초고진공 장치의 설계 및 제작과 LEED Optics에 의한 Auger Electron Spectrometer의 분해능 측정
이순보,박종윤,곽현태,부진효,이성용 성균관대학교 1992 論文集 Vol.42 No.2
A multipurpose Ultra High Vacuum chamber was designed and constructed in this laboratory. This enables us to be equipped with various analytical instruments such as Ar-ion gun LEED optics, Electron analyzer, and Quadrupole mass spectrometer etc. The 4-Grid LEED optics, a product of Omicron company in West Germany, was equipped with the UHV chamber and the LEED power supply was designed by this group. Turbo-C language figured out Auger spectra of the ad-species by means of the computer interface. The resolution of Auger electron spectrometer was measured with a constant primary electron beam energy. The results showed that the resolution was independent of the primary electron beam energy, but depends on the modulation voltage. Also, it was revealed that the resolution of 4-Grid optics was more improved than that of 3-Grid optics.
Ar 이온에 의해 Sputtering된 Pt(111) 표면의 NO 흡착
이순보,부진효,이성용,박종윤,곽현태 성균관대학교 기초과학연구소 1992 論文集 Vol.43 No.1
Adsorption of nitric oxide on the Pt(111) surface sputtered by Ar-ion has been studied using thermal desorption spectroscopy, Auger electron spectroscopy, and low energy electron diffraction. A thermal desorption spectrum obtained from the perfect Pt(111) saturated with NO at 300K is quite simillar to those reported previously. The main portion desorbs at about 370K(α-state) with a shoulder at about 470K(β-state). The chemisorption of nitric oxide is predominantly molecular on the Pt(111) surface, accompanied by a small amount of dissociation which becomes negligible when the Pt(111) surface is perfect. When the Pt(111) surface is sputtered by Ar-ion with 2KeV, the thermal desorption spectrum becomes quite complex. The shoulder peak, which appears on the perfect surface spectrum, increases with Ar-ion sputtering time. The maximum desorption spectra of N₂ and N₂O are observed simultaneously between 470 and 600K. The desorption mechanisms for N₂O are proposed. The increasing N₂ with the β-state of NO indicates that the β-state is a precursor to the NO dissociation.