Product Selection / Price Chart

Click on any cathode below to view additional specifications or to request a quote.  Quotes are determined by style and base type, including fitting a specific cathode to a customer supplied base.

To view products for SEM/TEM instruments and manufacturers, see Cathodes/Emitters for Microscopy.

Emitters Product Selection/Price Chart
Emitter TypeDescriptionModel # (style)SizePrice
Lanthanum Hexaboride (LaB6)
Single crystal with various microflat diameters Lanthanum Hexaboride (LaB6)
  • High current, high brightness, single crystal
  • Emission current densities up to 30 A/cm2
  • Range of emission surface sizes
  • Long lifetimes
  • Operating pressure < 10-7 torr
  • Custom sizes available
  • AEI base, compact CB-104 or request custom mounting
ES-423E
  Style 90-XX
Crystal with 90° cone, microflat size depends on column design:
< 100 μm dia
$875
ES-423E
  Style 90-15
  Style 90-20
See Emitters for Microscopy Chart
ES-423E
  Style 90-XXX
Crystal with 90° cone, microflat size depends on column design: 100 μm to 280 μm dia $945
ES-423E
  Style 90-300
Crystal with 90° cone, 300 μm dia $1,045
ES-423E
  Style 180-330
Flat crystal, 330 μm dia, extends above ferrule $1,045
Lanthanum Hexaboride (LaB6)
Single crystal in guard ring
Lanthanum Hexaboride (LaB6) with Guard Ring
  • Small diameters with microflats
  • Brightness > 106 A/cm2/sr
  • Operating pressure < 10-7 torr
  • Small spot, long lifetime
  • Emission current densities up to 30 A/cm2
  • Available on many bases
ES-423E - GR
  Style 90-XXX
Crystal with 90° cone, guard ring surrounds cone. Microflat range 5 μm to 250 μm $2,120
Lanthanum Hexaboride (LaB6)
High current, large diameter
Lanthanum Hexaboride (LaB6) large diameter
  • Large diameters, high cathode loading
  • 30 A/cm2, 10-7 torr, long lifetime
  • Emission currents up to 0.5 A
  • AEI base or custom mounting
  • VI test graphs included
ES-440 Flat crystal, 1.78 mm dia $1,715
Tantalum (Ta) Disc
Tantalum (Ta) Disc
  • General purpose planar disc cathode
  • 0.05 - 1.0 A/cm2, 10-5 torr
  • Emission up to tens of mAs
  • Two larger disc sizes for higher currents
ES-042 0.033" dia disc $108
ES-044 0.048" dia disc $195
ES-046 0.062" dia disc moly pins $278
Barium Oxide (BaO) Disc
Barium Oxide (BaO) Disc
  • Low light, low temperature
  • 0.25 A/cm2, 10-7 torr
  • Emission up to 3 mA
  • Two larger disc sizes for higher currents
ES-015 0.033" disc dia $235
ES-064 0.048" dia disc $298
ES-066 0.062" dia disc moly pins $384
Yttria Coated (Y2O3) Disc
Yittria Coated (Y2O3) Disc
  • Chemically resistant for poorer vacuum
  • 10-4 torr, low work function
  • Disc - 2.5 A/cm2, emission up to 10 mA
  • Three larger disc sizes for higher currents
ES-525 0.033" dia disc $285
ES-526 0.048" dia disc $376
ES-529 0.062" dia disc moly pins $450
Note: Prices quoted above are for emitters on AEI ceramic bases with Kovar pins.
Moly pins where noted are standard.
For Kimball Physics ceramic base (CB-104 or CB-105) Add $30
For molybdenum pins (non-magnetic applications) Add $45