@article {4581,
	title = {Direct evidences for inner-shell electron-excitation by laser induced electron recollision},
	journal = {arxiv},
	year = {2015},
	pages = {1509.05361},
	abstract = {Extreme ultraviolet (XUV) attosecond pulses, generated by a process known as laser-induced electron recollision, are a key ingredient for attosecond metrology, providing a tool to precisely initiate and probe sub-femtosecond dynamics in the microcosms of atoms, molecules and solids[1]. However, with the current technology, extending attosecond metrology to scrutinize the dynamics of the inner-shell electrons is a challenge, that is because of the lower efficiency in generating the required soft x-ray \hbar\omega\&gt;300 eV attosecond bursts and the lower absorption cross-sections in this spectral range. A way around this problem is to use the recolliding electron to directly initiate the desired inner-shell process, instead of using the currently low flux x-ray attosecond sources.Such an excitation process occurs in a sub-femtosecond timescale, and may provide the necessary "pump" step in a pump-probe experiment[2]. Here we used a few cycle infrared \lambda_0 1800nm source[3] and observed direct evidences for inner-shell excitations through the laser-induced electron recollision process. It is the first step toward time-resolved core-hole studies in the keV energy range with sub-femtosecond time resolution.},
	url = {http://arxiv.org/abs/1509.05361},
	author = {Deng, Yunpei and Zhinan Zeng and Zhengmao Jia and Pavel Komm and Yinhui Zheng and Xiaochun Ge and Ruxin Li and Marcus, Gilad}
}
