High Resolution Studies of Electron Excitation. III. Polarization near Threshold of Light from the 4D States of Helium
We have measured the polarization of the helium lines at 492.2 nm (41D-21P) and 447.2 nm (43D-23P) over an energy range of about 0.8 eV above threshold using velocity selected electrons. The measurements are free from the effects of instrumental polarization. In both cases we find that the value of...
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| Veröffentlicht in: | Proc. Roy. Soc. (London), Ser. A, v. 337, no. 1610, pp. 443-450 Ser. A, v. 337, no. 1610, pp. 443-450, 1974-03, Vol.337 (1610), p.443-450 |
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| container_title | Proc. Roy. Soc. (London), Ser. A, v. 337, no. 1610, pp. 443-450 |
| container_volume | 337 |
| creator | Heddle, D. W. O. Keesing, R. G. W. Watkins, R. D. |
| description | We have measured the polarization of the helium lines at 492.2 nm (41D-21P) and 447.2 nm (43D-23P) over an energy range of about 0.8 eV above threshold using velocity selected electrons. The measurements are free from the effects of instrumental polarization. In both cases we find that the value of the polarization at the lowest energies for which we can detect a signal is quite consistent with the threshold value predicted by conservation of angular momentum. At higher energies we find that the polarization falls rapidly. We suggest that this rapid fall is a consequence of a 1s 4d2 2S resonance just below the threshold. |
| doi_str_mv | 10.1098/rspa.1974.0060 |
| format | Article |
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III. Polarization near Threshold of Light from the 4D States of Helium</title><source>JSTOR Mathematics & Statistics</source><source>Jstor Complete Legacy</source><creator>Heddle, D. W. O. ; Keesing, R. G. W. ; Watkins, R. D.</creator><creatorcontrib>Heddle, D. W. O. ; Keesing, R. G. W. ; Watkins, R. D. ; York Univ., Eng</creatorcontrib><description>We have measured the polarization of the helium lines at 492.2 nm (41D-21P) and 447.2 nm (43D-23P) over an energy range of about 0.8 eV above threshold using velocity selected electrons. The measurements are free from the effects of instrumental polarization. In both cases we find that the value of the polarization at the lowest energies for which we can detect a signal is quite consistent with the threshold value predicted by conservation of angular momentum. At higher energies we find that the polarization falls rapidly. We suggest that this rapid fall is a consequence of a 1s 4d2 2S resonance just below the threshold.</description><identifier>ISSN: 1364-5021</identifier><identifier>ISSN: 0080-4630</identifier><identifier>EISSN: 1471-2946</identifier><identifier>EISSN: 2053-9169</identifier><identifier>DOI: 10.1098/rspa.1974.0060</identifier><language>eng</language><publisher>London: The Royal Society</publisher><subject>ANGULAR MOMENTUM ; Azimuth ; CONSERVATION LAWS ; D STATES ; Electron beams ; ELECTRON-ATOM COLLISIONS- EXCITATION ; ELECTRONIC STRUCTURE ; ELECTRONS ; Energy ; Energy value ; Fall lines ; Helium ; HELIUM- EMISSION SPECTRA ; Monochromators ; N60200 -Physics (Atomic & Molecular)-Atomic & Molecular Properties ; N60400 -Physics (Atomic & Molecular)-Collision Phenomena ; P STATES ; Parallel plates ; POLARIZATION ; RESOLUTION ; RESONANCE ; SPIN ORIENTATION ; Standard deviation ; THRESHOLD ENERGY ; VISIBLE RADIATION</subject><ispartof>Proc. Roy. Soc. (London), Ser. 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O.</creatorcontrib><creatorcontrib>Keesing, R. G. W.</creatorcontrib><creatorcontrib>Watkins, R. D.</creatorcontrib><creatorcontrib>York Univ., Eng</creatorcontrib><title>High Resolution Studies of Electron Excitation. III. Polarization near Threshold of Light from the 4D States of Helium</title><title>Proc. Roy. Soc. (London), Ser. A, v. 337, no. 1610, pp. 443-450</title><addtitle>Proc. R. Soc. Lond. A</addtitle><addtitle>Proc. R. Soc. Lond. A</addtitle><description>We have measured the polarization of the helium lines at 492.2 nm (41D-21P) and 447.2 nm (43D-23P) over an energy range of about 0.8 eV above threshold using velocity selected electrons. The measurements are free from the effects of instrumental polarization. In both cases we find that the value of the polarization at the lowest energies for which we can detect a signal is quite consistent with the threshold value predicted by conservation of angular momentum. At higher energies we find that the polarization falls rapidly. We suggest that this rapid fall is a consequence of a 1s 4d2 2S resonance just below the threshold.</description><subject>ANGULAR MOMENTUM</subject><subject>Azimuth</subject><subject>CONSERVATION LAWS</subject><subject>D STATES</subject><subject>Electron beams</subject><subject>ELECTRON-ATOM COLLISIONS- EXCITATION</subject><subject>ELECTRONIC STRUCTURE</subject><subject>ELECTRONS</subject><subject>Energy</subject><subject>Energy value</subject><subject>Fall lines</subject><subject>Helium</subject><subject>HELIUM- EMISSION SPECTRA</subject><subject>Monochromators</subject><subject>N60200 -Physics (Atomic & Molecular)-Atomic & Molecular Properties</subject><subject>N60400 -Physics (Atomic & Molecular)-Collision Phenomena</subject><subject>P STATES</subject><subject>Parallel plates</subject><subject>POLARIZATION</subject><subject>RESOLUTION</subject><subject>RESONANCE</subject><subject>SPIN ORIENTATION</subject><subject>Standard deviation</subject><subject>THRESHOLD ENERGY</subject><subject>VISIBLE RADIATION</subject><issn>1364-5021</issn><issn>0080-4630</issn><issn>1471-2946</issn><issn>2053-9169</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>1974</creationdate><recordtype>article</recordtype><recordid>eNp9UUFv0zAUjhBIjMGVAyeLe4IdO3Z8QmOUtlIHU1cQtyc3dYhLGle2M9b9-jkNmlQhdkree9_3vfd9TpK3BGcEy_KD83uVESlYhjHHz5IzwgRJc8n48_hPOUsLnJOXySvvtxhjWZTiLLmdmV8NWmpv2z4Y26Gb0G-M9sjWaNLqKrjYm9xVJqhhnKH5fJ6ha9sqZ-6PLdRp5dCqcdo3tt0MxEXUDKh2dodCoxH7HFVVGEVnujX97nXyolat12_-fs-T718mq8tZuvg2nV9eLNKKkRKn6yLP1bpQRa1LinMs1lgKyTUusCrWZalVXfIqdki9jkWx4VQoKnMuOK4lVfQ8eT_qWh8M-GhDV01luy46A0aJ4IJGUDaCKme9d7qGvTM75Q5AMAzRwhAtDNHCEG0k-JHg7CFebyujwwG2tnddLGF5c31BJJe3lApDeBTBJSVYsIJKuDf7o9wAgAgA432v4Qg7XfPvVvrU1v_e-m5kbX2w7tGZKJkcnKfj0Pig7x6Hyv2GGIwo4EfJYJpfraY_l5_ga8STEd_EF_5jnIaTW2Kxd14dbR0NMTbs-PgkZzg3vkjQXTghQt23Lew3NX0A_NbjAg</recordid><startdate>19740326</startdate><enddate>19740326</enddate><creator>Heddle, D. W. O.</creator><creator>Keesing, R. G. W.</creator><creator>Watkins, R. D.</creator><general>The Royal Society</general><scope>BSCLL</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>OTOTI</scope></search><sort><creationdate>19740326</creationdate><title>High Resolution Studies of Electron Excitation. III. Polarization near Threshold of Light from the 4D States of Helium</title><author>Heddle, D. W. O. ; Keesing, R. G. W. ; Watkins, R. 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A</addtitle><date>1974-03-26</date><risdate>1974</risdate><volume>337</volume><issue>1610</issue><spage>443</spage><epage>450</epage><pages>443-450</pages><issn>1364-5021</issn><issn>0080-4630</issn><eissn>1471-2946</eissn><eissn>2053-9169</eissn><abstract>We have measured the polarization of the helium lines at 492.2 nm (41D-21P) and 447.2 nm (43D-23P) over an energy range of about 0.8 eV above threshold using velocity selected electrons. The measurements are free from the effects of instrumental polarization. In both cases we find that the value of the polarization at the lowest energies for which we can detect a signal is quite consistent with the threshold value predicted by conservation of angular momentum. At higher energies we find that the polarization falls rapidly. We suggest that this rapid fall is a consequence of a 1s 4d2 2S resonance just below the threshold.</abstract><cop>London</cop><pub>The Royal Society</pub><doi>10.1098/rspa.1974.0060</doi><tpages>8</tpages></addata></record> |
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| ispartof | Proc. Roy. Soc. (London), Ser. A, v. 337, no. 1610, pp. 443-450, 1974-03, Vol.337 (1610), p.443-450 |
| issn | 1364-5021 0080-4630 1471-2946 2053-9169 |
| language | eng |
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| source | JSTOR Mathematics & Statistics; Jstor Complete Legacy |
| subjects | ANGULAR MOMENTUM Azimuth CONSERVATION LAWS D STATES Electron beams ELECTRON-ATOM COLLISIONS- EXCITATION ELECTRONIC STRUCTURE ELECTRONS Energy Energy value Fall lines Helium HELIUM- EMISSION SPECTRA Monochromators N60200 -Physics (Atomic & Molecular)-Atomic & Molecular Properties N60400 -Physics (Atomic & Molecular)-Collision Phenomena P STATES Parallel plates POLARIZATION RESOLUTION RESONANCE SPIN ORIENTATION Standard deviation THRESHOLD ENERGY VISIBLE RADIATION |
| title | High Resolution Studies of Electron Excitation. III. Polarization near Threshold of Light from the 4D States of Helium |
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