Electronic feshbach resonances created in soft x-ray-induced 02 dissociation

Vandana Sharma, Etienne Gagnon, Arvinder Singh Sandhu, Robin Santra, Wen Li, Phay Ho, Predrag Ranitovic, C. Lewis Cocke, Margaret M. Murnane, Henry C. Kapteyn

Research output: Contribution to journalArticle

Abstract

When an atom or molecule is ionized by an x-ray, super-excited states can be created that then decay, or autoionize, by ejecting a second electron from the ion. Here we find that autoionization following soft x-ray photoionization of molecular oxygen follows a complex, multi-step, process[1]. By interrupting the autoionization process using a short laser pulse, we show that autoionization cannot occur until the internuclear separation of the fragments is greater than 30 Ångstroms. As the ion and excited neutral atom separate, we directly observe the birth of a new state. We follow the transformation of electronically bound states of the molecular ion into Feshbach resonances of the neutral oxygen atom that are characterized by both positive and negative binding energies. States with negative binding energies have not been predicted or observed in neutral atoms previously.

Original languageEnglish (US)
Article number022071
JournalJournal of Physics: Conference Series
Volume194
Issue number2
DOIs
StatePublished - Dec 24 2009

Fingerprint

autoionization
neutral atoms
dissociation
binding energy
electronics
x rays
molecular ions
photoionization
oxygen atoms
ions
fragments
decay
oxygen
pulses
excitation
lasers
atoms
molecules
electrons

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Electronic feshbach resonances created in soft x-ray-induced 02 dissociation. / Sharma, Vandana; Gagnon, Etienne; Sandhu, Arvinder Singh; Santra, Robin; Li, Wen; Ho, Phay; Ranitovic, Predrag; Lewis Cocke, C.; Murnane, Margaret M.; Kapteyn, Henry C.

In: Journal of Physics: Conference Series, Vol. 194, No. 2, 022071, 24.12.2009.

Research output: Contribution to journalArticle

Sharma, V, Gagnon, E, Sandhu, AS, Santra, R, Li, W, Ho, P, Ranitovic, P, Lewis Cocke, C, Murnane, MM & Kapteyn, HC 2009, 'Electronic feshbach resonances created in soft x-ray-induced 02 dissociation', Journal of Physics: Conference Series, vol. 194, no. 2, 022071. https://doi.org/10.1088/1742-6596/194/2/022071
Sharma, Vandana ; Gagnon, Etienne ; Sandhu, Arvinder Singh ; Santra, Robin ; Li, Wen ; Ho, Phay ; Ranitovic, Predrag ; Lewis Cocke, C. ; Murnane, Margaret M. ; Kapteyn, Henry C. / Electronic feshbach resonances created in soft x-ray-induced 02 dissociation. In: Journal of Physics: Conference Series. 2009 ; Vol. 194, No. 2.
@article{3e71f0ce46594af9aebca6642d8caf2d,
title = "Electronic feshbach resonances created in soft x-ray-induced 02 dissociation",
abstract = "When an atom or molecule is ionized by an x-ray, super-excited states can be created that then decay, or autoionize, by ejecting a second electron from the ion. Here we find that autoionization following soft x-ray photoionization of molecular oxygen follows a complex, multi-step, process[1]. By interrupting the autoionization process using a short laser pulse, we show that autoionization cannot occur until the internuclear separation of the fragments is greater than 30 {\AA}ngstroms. As the ion and excited neutral atom separate, we directly observe the birth of a new state. We follow the transformation of electronically bound states of the molecular ion into Feshbach resonances of the neutral oxygen atom that are characterized by both positive and negative binding energies. States with negative binding energies have not been predicted or observed in neutral atoms previously.",
author = "Vandana Sharma and Etienne Gagnon and Sandhu, {Arvinder Singh} and Robin Santra and Wen Li and Phay Ho and Predrag Ranitovic and {Lewis Cocke}, C. and Murnane, {Margaret M.} and Kapteyn, {Henry C.}",
year = "2009",
month = "12",
day = "24",
doi = "10.1088/1742-6596/194/2/022071",
language = "English (US)",
volume = "194",
journal = "Journal of Physics: Conference Series",
issn = "1742-6588",
publisher = "IOP Publishing Ltd.",
number = "2",

}

TY - JOUR

T1 - Electronic feshbach resonances created in soft x-ray-induced 02 dissociation

AU - Sharma, Vandana

AU - Gagnon, Etienne

AU - Sandhu, Arvinder Singh

AU - Santra, Robin

AU - Li, Wen

AU - Ho, Phay

AU - Ranitovic, Predrag

AU - Lewis Cocke, C.

AU - Murnane, Margaret M.

AU - Kapteyn, Henry C.

PY - 2009/12/24

Y1 - 2009/12/24

N2 - When an atom or molecule is ionized by an x-ray, super-excited states can be created that then decay, or autoionize, by ejecting a second electron from the ion. Here we find that autoionization following soft x-ray photoionization of molecular oxygen follows a complex, multi-step, process[1]. By interrupting the autoionization process using a short laser pulse, we show that autoionization cannot occur until the internuclear separation of the fragments is greater than 30 Ångstroms. As the ion and excited neutral atom separate, we directly observe the birth of a new state. We follow the transformation of electronically bound states of the molecular ion into Feshbach resonances of the neutral oxygen atom that are characterized by both positive and negative binding energies. States with negative binding energies have not been predicted or observed in neutral atoms previously.

AB - When an atom or molecule is ionized by an x-ray, super-excited states can be created that then decay, or autoionize, by ejecting a second electron from the ion. Here we find that autoionization following soft x-ray photoionization of molecular oxygen follows a complex, multi-step, process[1]. By interrupting the autoionization process using a short laser pulse, we show that autoionization cannot occur until the internuclear separation of the fragments is greater than 30 Ångstroms. As the ion and excited neutral atom separate, we directly observe the birth of a new state. We follow the transformation of electronically bound states of the molecular ion into Feshbach resonances of the neutral oxygen atom that are characterized by both positive and negative binding energies. States with negative binding energies have not been predicted or observed in neutral atoms previously.

UR - http://www.scopus.com/inward/record.url?scp=85035044790&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85035044790&partnerID=8YFLogxK

U2 - 10.1088/1742-6596/194/2/022071

DO - 10.1088/1742-6596/194/2/022071

M3 - Article

AN - SCOPUS:85035044790

VL - 194

JO - Journal of Physics: Conference Series

JF - Journal of Physics: Conference Series

SN - 1742-6588

IS - 2

M1 - 022071

ER -