Renovations! Please excuse the mess, but we are in the process of overhauling the site.
Appendices, say, "Electron volt" Edit, click, copy, click.
Another Gary Search Page, say, "HotBot", click,
Then, "HotBot", Search, click, paste for "Electron volt" , click, then Find
Searching Entries for Find (Edit, then Find)
Seven types of string searches are available, 1) search for an author, (your name) 2) search for a title (or part of a title), 3) search for a journal, 5) search by year, or 6) search by keyword.
453
Appendices
|
1. Some Physical Constants |
|
|
Boltzmann constant |
k = 1.38 x 10-16 erg/deg |
|
= 8.6164 x 10-5 eV/deg |
|
|
Avogadro’s number |
6.028 x 1023 |
|
Loschmidt’s number |
2.687 x 1019 cm2 |
|
Electron mass |
m = 9.108 x 10-28 g |
|
Proton mass |
M = 1.672 x 10-24 g |
|
Electron charge |
e = 4.802 x 10-10 esu |
|
1.6 x 10-19 C |
|
|
Planck’s constant |
h = 6.625 x l0-27 erg× sec |
|
Radius of first Bohr orbit |
a o = 0.529 x 10-8 cm |
|
Electron volt |
1 eV |
|
= 1.6 x 10-12 erg |
|
|
= 23.06 kcal/mole |
|
|
= 8066 cm-1 |
|
|
Stefan-Boltzmann constant s |
5.76 x 10-12 joule/(cm2× sec× deg4) |
|
Wavelength of electron with energy E in eV |
l = 12.264 x 10-8(E)-1/2 |
|
Average electron velocity with energy E in eV |
ve @ cm/sec = 6.23 x 105 (Te,° K)1/2 |
|
= 5.93 x 107 (E, eV)1/2 |
|
|
Mean ion (Cs) velocity with energy E in eV |
vi @. cm/sec = 1.25 x 103 (Ti,° K)1/2 |
|
= 1.19 x 105 (E)1/2 |
|
|
Debye length |
LD cm = 6.87 (Te,° K/n, cm-3)1/2 |
|
Plasma (Langmuir) frequency |
w p Hz = 5.66 x 104(n, cm-3)1/2 |
454
2. Correlation of Some Physical Quantities for a Cesium Plasma
Fig. Appendices 2
455
|
3. Some Emission Parameters* |
|||
|
Element |
Work Function (f ), eV |
Richardson’s Constant (A) amp/cm2× deg2 |
Remarks |
|
3 Li |
2.33 |
||
|
11 Na |
2.35 |
||
|
19 K |
2.22 |
||
|
28 Ni |
4.5 |
20 ± 5 |
Polycrystal, value of f is apparently reduced by 0.3 - 0.5 eV |
|
4.89 ± 0.03 |
900 |
Face [100] |
|
|
5.22 ± 0.03 |
1800 |
Face [111] |
|
|
29 Cu |
4.4 |
60.2 |
Polycrystal |
|
5.6 |
Face [100] |
||
|
4.87 |
Face [111] |
||
|
37 Rb |
2.16 |
||
|
41 Nb |
3.99 |
Polycrystal |
|
|
3.95 ± 0.03 |
90 ± 20 |
Face [100] |
|
|
4.80 ± 0.05 |
80 ± 30 |
Face [110] |
|
|
3.88 ± 0.03 |
15 ± 20 |
Face [111] |
|
|
42 Mo |
4.3 |
Polycrystal |
|
|
4.4 ± 0.03 |
Face [100] |
||
|
5.05 ± 0.05 |
Face [110] |
||
|
4.12 ± 0.03 |
Face [111] |
||
|
47 Ag |
4.3 |
Polycrystal |
|
|
54 Cs |
1.81 |
||
|
56 Ba |
2.49 |
||
|
73 Ta |
4.12 |
Polycrystal |
|
|
4.15 ± 0.02 |
Face [100] |
||
|
4.7 |
Face [110] |
||
|
4.0 |
Face [111] |
||
|
74 W |
4.54 |
Polycrystal |
|
|
4.65 ± 0.02 |
Face [100] |
||
|
5.33 ± 0.04 |
Face [110] |
||
|
4.3 ± 0.1 |
Face [111] |
||
|
75 Re |
5.0 |
Polycrystal |
|
|
5.53 ± 0.03 |
790 - 120 |
Face [1000] |
|
|
5.05 ± 0.04 |
140 |
Face [1010] |
|
|
78 Pt |
5.32 |
Polycrystal |
|
|
79 Au |
4.3 |
Polycrystal |
|
|
Stainless Steel |
4.76 |
||
|
*Data recommended by V.S. Fomenko and G.W. Samsonov in Handbook of Thermionic Properties, Plenum, New York (1966). (also see Solid State Surface Science, ed. by M. Green, Vol. 1, Dekker, New York (1969)) |
|||
456
4. Temperature Dependence of Thermionic Emission At Different Emitter Work Functions.
Fig. Appendices 4
457
5. Temperature Dependence of Equilibrium Electron Density at Different Cesium Vapor Pressures.
Fig. Appendices 5
458
6. Temperature Dependence of Chemical Potential at Different Cesium Vapor Pressures.
Fig. Appendices 6