@article{Swoboda2010,
	title = {Phase measurement of resonant two-photon ionization in helium.},
	volume = {104},
	issn = {0031-9007},
	doi = {10.1103/PhysRevLett.104.103003},
	abstract = {We study resonant two-color two-photon ionization of helium via the 1s3p (1)P(1) state. The first color is the 15th harmonic of a tunable Ti:sapphire laser, while the second color is the fundamental laser radiation. Our method uses phase-locked high-order harmonics to determine the phase of the two-photon process by interferometry. The measurement of the two-photon ionization phase variation as a function of detuning from the resonance and intensity of the dressing field allows us to determine the intensity dependence of the transition energy.},
	number = {MARCH},
	journal = {Physical review letters},
	author = {Swoboda, M and Fordell, T and Klünder, K and Dahlström, J M and Miranda, M and Buth, C and Schafer, K J and Mauritsson, J and L'Huillier, A and Gisselbrecht, M},
	year = {2010},
	pmid = {20366419},
	note = {arXiv: 1002.2550},
	keywords = {\#nosource},
	pages = {103003},
}

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