Abstract
The results of field emission microscopy investigation of the adsorption and thermal desorption of water deposited on a thermally clean and gold-covered tungsten emitter are presented. The desorption experiments indicate that H 2O molecules dissociate in contact with surfaces of the clean tungsten emitter, but no traces of dissociation of water adsorbed on Au W were found, if only the gold coverage was sufficiently high ( Θ ≥ 2). H 2O is probably adsorbed in two adsorption states on Au W . Water desorption from the first state was carried out in the temperature range 145–155 K with an activation energy of 51.5 ± 1.5 kJ/mol, whereas the desorption from the second state was observed at 220–240 K. Generally, the adsorption of water causes the reduction of the emission current at a constant high voltage, both for W and Au W , but for the second adsorption state in the system H 2O/Au/W a slight increase of the emission current was noticed. The behaviour of water adlayer in the presence of the high electric field is discussed.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
