Angle-Resolved Spectroscopy of Positronium Emission from a Cu(110) Surface

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F16%3A10330783" target="_blank" >RIV/00216208:11320/16:10330783 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1103/PhysRevLett.117.216402" target="_blank" >http://dx.doi.org/10.1103/PhysRevLett.117.216402</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1103/PhysRevLett.117.216402" target="_blank" >10.1103/PhysRevLett.117.216402</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Angle-Resolved Spectroscopy of Positronium Emission from a Cu(110) Surface

Popis výsledku v původním jazyce

The affinity A(Ps) of positronium (Ps) atoms for a metal is the negative of the maximum kinetic energy with which Ps is emitted into vacuum when thermalized positrons in a metal encounter the surface. When this quantity is measured by ground state Ps time of flight (TOF), the precision is severely limited by the short triplet state lifetime of 142 ns. By quickly converting the emitted Ps atoms into long-lived Rydberg states, we are able to dramatically increase the TOF to allow precision measurements of APs. From our measurements made on a Cu(110) sample at T = 128 K, we find A(Ps)(128 K) = (-2.476 +/- 0.010(stat) +/- 0.013(syst)) eV, compared with the result A(Ps)(128 K) = (-2.545 +/- 0.010(num) +/- 0.010(syst)) eV found using highly accurate generalized gradient approximations for both electrons and positrons within density functional theory. Such precision opens up opportunities in the quest for an improved density functional.

Název v anglickém jazyce

Angle-Resolved Spectroscopy of Positronium Emission from a Cu(110) Surface

Popis výsledku anglicky

The affinity A(Ps) of positronium (Ps) atoms for a metal is the negative of the maximum kinetic energy with which Ps is emitted into vacuum when thermalized positrons in a metal encounter the surface. When this quantity is measured by ground state Ps time of flight (TOF), the precision is severely limited by the short triplet state lifetime of 142 ns. By quickly converting the emitted Ps atoms into long-lived Rydberg states, we are able to dramatically increase the TOF to allow precision measurements of APs. From our measurements made on a Cu(110) sample at T = 128 K, we find A(Ps)(128 K) = (-2.476 +/- 0.010(stat) +/- 0.013(syst)) eV, compared with the result A(Ps)(128 K) = (-2.545 +/- 0.010(num) +/- 0.010(syst)) eV found using highly accurate generalized gradient approximations for both electrons and positrons within density functional theory. Such precision opens up opportunities in the quest for an improved density functional.

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

BM - Fyzika pevných látek a magnetismus

OECD FORD obor

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Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2016

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Physical Review Letters

ISSN

0031-9007

e-ISSN

—

Svazek periodika

117

Číslo periodika v rámci svazku

21

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

5

Strana od-do

—

Kód UT WoS článku

000388282500004

EID výsledku v databázi Scopus

2-s2.0-84995969871