Hollow Cathode LampsThe most common

Hollow Cathode Lamps
The most common source for atomic absorption measurements is the hollow cathode lamp,such as the oneshown in Figure 9-11.10 This type of lamp consists of a
tungsten anode and a cylindrical cathode sealed in aglass tube that is filled with neOIil or argon at a pressUl of 1 to 5 torr. The cathode is constructed of the metal
whose spectrum is desired or serves to support a layerof that metaLIonization of the inert gas occurs when a potentialon the order, of 300 V is applied across theelectrodes,which genetates a current of about 5 to 15 rnA as ionsand electrons migrate to the electrodes. If the potentialis sufficiently large, the gaseous cations acquire enoughkinetic energy to dislodge some of the metal atoms from the cathode surface and produce an atomic cloud in a process called sputtering. A portion of the sputtered
metal atoms are in excited states and thus emit their
characteristic radiation as they return to the ground
state. Eventually, the metal atoms diffuse back to the
cathode surface or to the glass walls of the tube and are
redeposited.

ผลลัพธ์ (อังกฤษ) 3:

Hollow Cathode Lamps The most common source for atomic absorption measurements is the hollow cathode lamp, such as the oneshown in Figure 9 - 11.10 This lamp consists of a type of
tungsten anode and cathode sealed in a cylindrical tube that is filled with aglass neOIil or argon at a pressUl of 1 to 5 torr.The cathode is constructed of the metal
whose spectrum is desired or that serves to support a layerof metaLIonization of the inert gas occurs when a potentialon the order, of 300 is applied across V theelectrodes, which genetates a current of about 5 to 15 as rnA ionsand electrons migrate to the electrodes, the If potentialis sufficiently large,The gaseous cations enoughkinetic acquire energy to dislodge some of the metal atoms from the cathode surface and produce an atomic cloud in a process called sputtering. A
metal portion of the sputtered atoms are excited in their states and thus emit characteristic radiation
as they return to the ground state
. Eventually, the metal atoms diffuse back to the
cathode surface or to the glass walls of the tube are
and redeposited.