Matches in DBpedia 2014 for { <http://dbpedia.org/resource/Hollow-cathode_lamp> ?p ?o. }
Showing items 1 to 40 of
40
with 100 items per page.
- Hollow-cathode_lamp abstract "A hollow-cathode lamp (HCL) is type of lamp used in physics and chemistry as a spectral line source (e.g. for atomic absorption spectrometers) and as a frequency tuner for light sources such as lasers.An HCL usually consists of a glass tube containing a cathode, an anode, and a buffer gas (usually a noble gas). A large voltage across the anode and cathode will cause the buffer gas to ionize, creating a plasma. The buffer gas ions will then be accelerated into the cathode, sputtering off atoms from the cathode. Both the buffer gas and the sputtered cathode atoms will in turn be excited by collisions with other atoms/particles in the plasma. As these excited atoms decay to lower states, they will emit photons, which can then be detected and a spectrum can be determined. Either the spectrum from the buffer gas or the sputtered cathode material itself, or both, may be of interest.An HCL can also be used to tune light sources to a specific atomic transition by making use of the optogalvanic effect, which is a result of direct or indirect photoionization. By shining the light source into the HCL, one can excite or even eject electrons (directly photoionize) from the atoms inside the lamp, so long as the light source includes frequencies corresponding to the right atomic transitions. Indirect photoionization can then occur when electron collisions with the excited atom eject an atomic electron. = atom, = photon, = atom in excited state, and = electronThe newly created ions cause an increase in the current across the cathode/anode and a resulting change in the voltage, which can then be measured. To tune the light source to a specific transition frequency, a tuning parameter (often the driving current) of the light source is varied. By looking for a resonance on a data plot of the voltage signal versus source tuning parameter, the light source can be tuned to the desired frequency. This is often aided by use of a lock-in circuit.".
- Hollow-cathode_lamp thumbnail Hollow_Cathode_Lamp.svg?width=300.
- Hollow-cathode_lamp wikiPageID "2387957".
- Hollow-cathode_lamp wikiPageRevisionID "581235019".
- Hollow-cathode_lamp hasPhotoCollection Hollow-cathode_lamp.
- Hollow-cathode_lamp subject Category:Atomic_physics.
- Hollow-cathode_lamp subject Category:Gas_discharge_lamps.
- Hollow-cathode_lamp subject Category:Optical_devices.
- Hollow-cathode_lamp type Artifact100021939.
- Hollow-cathode_lamp type Device103183080.
- Hollow-cathode_lamp type DischargeLamp103206023.
- Hollow-cathode_lamp type GasDischargeLamps.
- Hollow-cathode_lamp type Instrumentality103575240.
- Hollow-cathode_lamp type Lamp103636248.
- Hollow-cathode_lamp type Object100002684.
- Hollow-cathode_lamp type OpticalDevice103851341.
- Hollow-cathode_lamp type OpticalDevices.
- Hollow-cathode_lamp type PhysicalEntity100001930.
- Hollow-cathode_lamp type SourceOfIllumination104263760.
- Hollow-cathode_lamp type Whole100003553.
- Hollow-cathode_lamp comment "A hollow-cathode lamp (HCL) is type of lamp used in physics and chemistry as a spectral line source (e.g. for atomic absorption spectrometers) and as a frequency tuner for light sources such as lasers.An HCL usually consists of a glass tube containing a cathode, an anode, and a buffer gas (usually a noble gas). A large voltage across the anode and cathode will cause the buffer gas to ionize, creating a plasma.".
- Hollow-cathode_lamp label "Hohlkathodenlampe".
- Hollow-cathode_lamp label "Hollow-cathode lamp".
- Hollow-cathode_lamp label "Lampada a catodo cavo".
- Hollow-cathode_lamp label "Lámpara de cátodo hueco".
- Hollow-cathode_lamp label "Lâmpada de cátodo oco".
- Hollow-cathode_lamp label "Лампа с полым катодом".
- Hollow-cathode_lamp label "ホロカソードランプ".
- Hollow-cathode_lamp sameAs Hohlkathodenlampe.
- Hollow-cathode_lamp sameAs Lámpara_de_cátodo_hueco.
- Hollow-cathode_lamp sameAs Lampada_a_catodo_cavo.
- Hollow-cathode_lamp sameAs ホロカソードランプ.
- Hollow-cathode_lamp sameAs Lâmpada_de_cátodo_oco.
- Hollow-cathode_lamp sameAs m.078fty.
- Hollow-cathode_lamp sameAs Q903200.
- Hollow-cathode_lamp sameAs Q903200.
- Hollow-cathode_lamp sameAs Hollow-cathode_lamp.
- Hollow-cathode_lamp wasDerivedFrom Hollow-cathode_lamp?oldid=581235019.
- Hollow-cathode_lamp depiction Hollow_Cathode_Lamp.svg.
- Hollow-cathode_lamp isPrimaryTopicOf Hollow-cathode_lamp.