We observed the dynamical evolution of the electron–nuclear wavepacket composed of the ##IMG## [http://ej.iop.org/images/0953-4075/53/16/164001/bab94ccieqn2.gif] {${B}^{2}{{\Sigma}}_{\text{g}}^{-}$} and 3 2 Π u states of ##IMG## [http://ej.iop.org/images/0953-4075/53/16/164001/bab94ccieqn3.gif] {${\mathrm{O}}_{2}^{+}$} with an evolution period of 1.3 fs. We created a dissociative wavepacket of ##IMG## [http://ej.iop.org/images/0953-4075/53/16/164001/bab94ccieqn4.gif] {${\mathrm{O}}_{2}^{+}$} by photoionization of O 2 with the irradiation of an intense attosecond pulse train (APT) in the extreme ultraviolet (XUV) wavelength region, and probed it with another XUV APT by scanning delay between the two APTs. We revealed the evolution of the electron–nuclear wavepacket by the analysis of the spectral phase in the Fourier transform of the recorded delay dependent momentum spectrum of O +...

中文翻译：

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## IMG ##中的超快电子核波包[http://ej.iop.org/images/0953-4075/53/16/164001/toc_bab94ccieqn1.gif] {$ {\ mathbf {O}} _ {2 } ^ {\ mathbf {+}} $}生成并使用阿秒脉冲序列进行探测

我们观察到由## IMG ## [http://ej.iop.org/images/0953-4075/53/16/164001/bab94ccieqn2.gif] {$ {B } ^ {2} {{\\ Sigma}} _ {\ text {g}} ^ {-} $}和## IMG ## [http://ej.iop.org/images/ 0953-4075 / 53/16/164001 / bab94ccieqn3.gif] {$ {\ mathrm {O}} _ {2} ^ {+} $}，进化周期为1.3 fs。我们创建了## IMG ##的分离波包[http://ej.iop.org/images/0953-4075/53/16/164001/bab94ccieqn4.gif] {$ {\ mathrm {O}} _ {2 } ^ {+} $}通过在极紫外（XUV）波长区域内照射强的阿秒脉冲串（APT）使O 2光电离，然后通过扫描两个APT之间的延迟用另一个XUV APT对其进行探测。