Journal
PHYSICAL REVIEW LETTERS
Volume 109, Issue 9, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.109.093604
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Funding
- National Science Foundation Physics Division Grant
- Office of Naval Research
- Robert A. Welch Foundation [A-1261]
- National Science Foundation [PHY-1205868]
- Herman F. Heep and Minnie Belle Heep Texas A&M University Endowed Fund
- Program in Plasma Science & Technology (PPST) at Princeton University
- Direct For Mathematical & Physical Scien
- Division Of Physics [1205868] Funding Source: National Science Foundation
- Direct For Mathematical & Physical Scien
- Division Of Physics [1068554, 1241032] Funding Source: National Science Foundation
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Using femtosecond transient absorption spectroscopy on excited-state helium atoms in a plasma created through optical field ionization, we measured the decay of 2(3)S-2(3)P excitation with sub-ps temporal resolution. The population evolution shows that initial decay is significantly faster than the electron-atom collisions and three orders of magnitude faster than the single atom spontaneous decay rate. This indicates on superradiant coherent behavior of the atomic system inside the plasma.
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