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 Type	Description	Model # (style)	Size	Price
Lanthanum Hexaboride (LaB6) Single crystal with various microflat diameters	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	$820
		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	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	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	ES-440	Flat crystal, 1.78 mm dia	$1,520
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	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	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