Metal	F(eV)
	(Work Function)
Ag (silver)	4.26
Al (aluminum)	4.28  see notes
Au (gold)	5.1
Cs (cesium)	2.14
Cu (copper)	4.65
Li (lithium)	2.9
Pb (lead)	4.25
Sn (tin)	4.42
Chromium	4.6
Molybdenum	4.37
Stainless Steel	4.4
Gold	4.8
Tungsten	4.5
Copper	4.5
Nickel	4.6

Links:

Field Emission Applet

Notes:

	Sources:  various (listed in my dissertation), but here are main sources: G.A. Farral, “Electrical Breakdown in Vacuum”, pp.28-31, from _Vacuum Arcs Theory and Applications_, J.M. Lafferty ed., John Wiley & Sons, New York (1980) C.J. Bennette, L.W. Swanson, and F.M. Charbonnier, /J. Appl. Phys./ *28*, p.634 (1967) See CRC Handbook for a complete list of work functions.
	The actual work function is VERY dependent (usually) several factors including morphology, preparation, gas on surface, oxidation...
	Aluminum is a strange one...  Once exposed to atmosphere the surface oxidizes and the effective work function increases to values of 10 or 11  !!!!
	Most common metals can be roughly assumed to have a work function of ~4.5