1,320 research outputs found

    Cortical and Subcortical Organization Participating in Tactual Pattern Perception in Man: A PET study

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    開始ページ、終了ページ: 冊子体のページ付

    Assessment of Dopamine Neurotransmission in Dementia Using Positron Emission Tomography

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    開始ページ、終了ページ: 冊子体のページ付

    ANALYTICAL STUDY ON TPD MEASUREMENTS DURING NEA ACTIVATION PROCESS

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    We have investigated the desorption of absorbed Cs-related species on the sample surface by temperature programed desorption (TPD). After forming the negative electron affinity (NEA) surface by alternating supply of Cs and O_2 onto the clean p-GaAs (100) surface in an ultra-high vacuum condition. It was found that Cs had several forms of adsorption states on the NEA surface from TPD measurements. The quantum efficiency under 826 nm illumination drops to zero over 300°C, while that with 367 nm drops to zero at about 500°C. It is considered that Cs desorbed about 100 to 300°C was deeply involved in the formation of the NEA surface
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