Shinku

Special Issue: Recent Developments in Desorption Induced by Electronic Transitions (DIET)

Foreword

[title in Japanese]

Katsumi TANIMURA

2006 Volume 49 Issue 10 Pages 579-580
Published: 2006
Released on J-STAGE: June 29, 2007

DOIhttps://doi.org/10.3131/jvsj.49.579

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Reviews

Laser-induced Desorption from Semiconductor Surfaces and its Electronic Mechanism

Junichi KANASAKI, Katsumi TANIMURA

2006 Volume 49 Issue 10 Pages 581-587
Published: 2006
Released on J-STAGE: June 29, 2007

DOIhttps://doi.org/10.3131/jvsj.49.581

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Adsorbate Dynamics Induced by Tunneling Electrons

Kazuhiko HASEGAWA, Shigeno MATSUMOTO, Hideaki KASAI

2006 Volume 49 Issue 10 Pages 588-592
Published: 2006
Released on J-STAGE: June 29, 2007

DOIhttps://doi.org/10.3131/jvsj.49.588

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Desorption Induced by Electronic Transitions at the Surface of Rare Gas Solids

Ichiro ARAKAWA, Takato HIRAYAMA

2006 Volume 49 Issue 10 Pages 593-599
Published: 2006
Released on J-STAGE: June 29, 2007

DOIhttps://doi.org/10.3131/jvsj.49.593

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Desorption Induced by Excited Electrons from Semiconductor Surfaces (I)
—Desorption Induced by Electron-/hole-injection into Halogen-adsorbed Silicon Surfaces—

Kenichi SHUDO, Masatoshi TANAKA

2006 Volume 49 Issue 10 Pages 600-604
Published: 2006
Released on J-STAGE: June 29, 2007

DOIhttps://doi.org/10.3131/jvsj.49.600

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We review excited-electron-induced desorption from halogen-adsorbed semiconductor surfaces, focusing on desorption processes associated with electron-beam irradiation using an electron gun and hole-injection using a scanning tunneling microscope. Recent studies on halogen-adsorbed silicon surfaces, i.e., typical etching systems, are described from the viewpoint of desorption induced by electronic transitions (DIET).

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Mechanism of Photo-stimulated Desorption of Hydrogen Molecules

Katsuyuki FUKUTANI, Tatsuo OKANO

2006 Volume 49 Issue 10 Pages 605-609
Published: 2006
Released on J-STAGE: June 29, 2007

DOIhttps://doi.org/10.3131/jvsj.49.605

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Pioneers of Study on Desorption Induced by Electronic Transitions; Achievements by Dr. Yoshioki Ishikawa and Dr. Yoshio Ohta

Kazuhiko MASE, Akira NAMBU

2006 Volume 49 Issue 10 Pages 610-617
Published: 2006
Released on J-STAGE: June 29, 2007

DOIhttps://doi.org/10.3131/jvsj.49.610

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Dr. Yoshioki Ishikawa is a pioneer who carried out systematic electron stimulated desorption (ESD) investigations for hydrogen adsorbed on a clean platinum plate (H₂/Pt) under ultrahigh vacuum (UHV) conditions in 1942. (His name is spelled as Yosioki Isikawa in the original papers.) Although his papers are referred in several papers on desorption induced by electronic transitions (DIET), these seem to be not as well-known as famous ones by Menzel, Gomer, and Redhead in 1964. We describe his pioneering work in this article. He developed an UHV apparatus made of glass with a Pt plate and an oxide cathode pumped by a small mercury pump via a liquid air trap. Clear ESD signals were observed for H₂/Pt at excitation energies of 8, 12, 14, 33-46, and 46-51 eV. He assigned the desorbate to atomic hydrogen (H), because it was pumped by a glass wall baked above 350°C. Based on these results and the potential curves of H₂ in the gas phase, he proposed a model for the ESD of H from H₂/Pt; that is, the first step is an electronic transition of adsorbed H₂, and the second is the desorption of H along the repulsive potential surface of the excited state. This was the first introduction of the notion of DIET. He also carried out an ESD study of H₂O/Pt in 1943. We also introduce achievements by Dr. Yoshio Ohta, who was another pioneer in the field of DIET. He measured electron-stimulated ion desorption from an oxidized Ni plate. He found that the threshold excitation energy for ion desorption is 22 eV, and that the kinetic energy of the desorbed ion is 1∼2 eV. To explain these results, he also proposed the concept of DIET.

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Regular Papers

Review

Microplasma Generated in a Gap of Sliding Contact

Keiji NAKAYAMA

2006 Volume 49 Issue 10 Pages 618-623
Published: 2006
Released on J-STAGE: June 29, 2007

DOIhttps://doi.org/10.3131/jvsj.49.618

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Article

Surface Treatment of Cylinder-shaped Polymer Materials Using Atmospheric-pressure Plasma

Kenji ODAGAWA, Mitsuru SADAMOTO, Shigeru ONO

2006 Volume 49 Issue 10 Pages 624-629
Published: 2006
Released on J-STAGE: June 29, 2007

DOIhttps://doi.org/10.3131/jvsj.49.624

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A treatment apparatus using atmospheric-pressure plasma was newly developed to treat the inner-surface of tube connectors for medical use. Improving the structure of opposed coaxial electrodes and applying time-modulated RF power between the electrodes enabled uniform inner-surface treatments that did not necessarily need rare gas. In the treatments using nitrogen or helium, the contact angle of water droplets lower than 20 deg was obtained. The mechanism of the good hydrophilic property was discussed using the results of optical emission spectroscopy of plasma, x-ray photoelectron spectroscopy and contact angle of water droplets on a treated surface.

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