IUVSTA 15th International Vacuum Congress (IVC-15), AVS 48th International Symposium (AVS-48), 11th International Conference on Solid Surfaces (ICSS-11)
    Applied Surface Analysis Monday Sessions
       Session AS-MoP

Paper AS-MoP7
Innovative Design of a Temperature Controlled Sample Holder

Monday, October 29, 2001, 5:30 pm, Room 134/135

Session: Student Poster Competition/Aspects of Applied Surface Analysis I Poster Session
Presenter: D. Castro Alves, New University of Lisbon, Portugal
Authors: D. Castro Alves, New University of Lisbon, Portugal
O.M.N.D. Teodoro, New University of Lisbon, Portugal
A.M.C. Moutinho, New University of Lisbon, Portugal
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To study many surface phenomena, the sample temperature is a fundamental parameter. Adsorption and desorption, as well as diffusion, are examples of experiments where the temperature plays an important role. In this work, we described a sample holder adequate to work in a temperature range of 100K to 1200K with the possibility to achieve fast cooling and heating rates. The central part of the sample holder is similar to a ball bearing. The external piece was built in copper OHFC and is connected to the cold source a liquid nitrogen reservoir. The inner ring was made in molybdenum and holds the sample. Between this ring and the external piece, sapphire balls provide the proper thermal connection good thermal conductivity at low temperatures and poor cond uctivity at high temperatures. The sample may be tight and released via a bolt in the external piece. Since the perimeter of this piece is open, the bolt decreases the perimeter of the groove where the balls are fitted and subsequently the inner ring (als o open) is compressed against the sample. This provides a very good thermal contact without the need of welding, as is the case of many sample holders. In order to control the temperature, heating is provided by electron bombardment from the opposite side of the surface under study. A thermocouple is connected directly the sample and is used to measure the temperature. Control is performed by computer. Further details as well as heating and cooling rates will be presented.