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## Revista mexicana de física

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*Print version* ISSN 0035-001X

### Rev. mex. fis. vol.58 n.2 México Apr. 2012

**Erratum**

L.H. Haber, B. Doughty, and S.R. Leone: "Photoelectron velocity map imaging of single–photon and pump–probe ionization of noble gases using femtosecond high–order harmonics," *Rev. Mex. Fis. S ***56**(2) (2010) 85–87.

•The complete 3^{rd}paragraph of page 85 should read:"The photoelectron angular distributions of randomly oriented atoms and molecules from single–photon ionization using linearly polarized light is given by where

ais the total cross section,θis the angle between the laser polarization and electron velocity vectors, andβis the anisotropy parameter associated with the second order Legendre polynomial [1]. For atoms, the anisotropy parameter can be described using the equation,where Δ =

δ_{l}_{+1}– δ_{l}_{–1}[2]. Here,δ_{l}_{±1}is the phase shift andD_{l}_{±1}is the radial dipole matrix element of the partial wave of angular momentuml± 1. For an electron originally in an atomic orbital of angular momentuml, the outgoing partial waves will have angular momenta ofl± 1 and the interference pattern of these partial waves results in the observed photoelectron angular distributions. The radial dipole matrix elements and the phase shift differences depend on photoelectron energy and provide information on both the bound and continuum wavefunctions. The anisotropy parameters, therefore, provide detailed information on properties of photoionization."

•The first complete paragraph of page 86 should read:"Inverted images from single–photon ionizations of He, Ne, Ar, and Xe are shown in Figs. 1a–1d. The anisotropy parameter,

β, is evaluated at the peak radius for each ring. Using the 17harmonic (26.5 eV), the^{th}βvalues of He and Ne are 2.03±0.05 and 0.24±0.01, respectively. Using the 13harmonic (20.2 eV), the^{th}βvalues for the ionization of Ar to the^{2}P_{3/2}state and Xe to the^{2}P_{1/2}and^{2}P_{3/2}states are 0.85±0.06, 1.59±0.07, and 1.72±0.04, respectively. For He, there is only one partial wave, thePwave, and the expectedβvalue of 2.00 is in agreement with the measurements. Additional photoelectron images from single photon ionization of Ne, Ar, and Xe were taken with the 11and 13^{th}harmonics. Using the 11^{th }harmonic (17.1 eV) the^{th}βvalues for the ionizations of Ar to the^{2}P_{3/2}state and Xe to the^{2}P_{1/2}and^{2}P_{3/2}states are 0.27±0.05, 1.05±0.10, and 1.45±0.01, respectively. Using the 15harmonic (23.4 eV), the^{th}βvalues for the ionization of Ne and Ar are –0.16±0.03 and 1.27±0.01, respectively. All reported anisotropy parameters are in excellent agreement with literature values [7–9]."