The linked page gives several different measurement methods and shows values for different metals measured in different ways.

http://www.kayelaby.npl.co.uk/atomic_and_nuclear_physics/4_3/4_3.html

thenks

Hi Abdallah,

Thank you Keith for the linked page. I would like to mention that for all methods and particularly for an absolute one, such Fowler photoelectric method, the surface state (contamination, adsorbates, morphology, microstructure, ...) of the sample play a key role in determining the EWF of the material. I have personnally measured EWF of many samples (metals : Cu, Ni, Sn, Ag, Zn; binary alloys: AgNi, AgW (measured by my colleague N. Zouache), AgZnO, AgCdO, AgSnO2, ...) versus heat treatment, temperature, degassing in vacuum, etc. The physics of the phenomena is not yet well understood. However, to have an insight about the topics, you can for instance upload my thesis (in french) and several papers from the link below:

https://www.researchgate.net/profile/Mohamed_Akbi

Here below is the link to take a look to my thesis:

https://www.researchgate.net/publication/306307509_Ph_D_Thesis_DETERMINATION_PHOTOELECTRIQUE_DU_TRAVAIL_DE_SORTIE_DES_MATERIAUX_DE_CONTACT_SUIVANT_LEUR_UTILISATION_INDUSTRIELLE?ev=prf_pub

Data Ph. D. Thesis : "DETERMINATION PHOTOELECTRIQUE DU TRAVAIL DE...

thank you very mutch