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Analysis Of Multiphoton Ionization Of Metal Atoms In The Saturation Regime Using Subpicosecond Krf Laser Pulses, B. Witzel, Cornelis J. Uiterwaal, H. Schröder, D. Charalambidis, K.-L. Kompa
Analysis Of Multiphoton Ionization Of Metal Atoms In The Saturation Regime Using Subpicosecond Krf Laser Pulses, B. Witzel, Cornelis J. Uiterwaal, H. Schröder, D. Charalambidis, K.-L. Kompa
C.J.G.J. Uiterwaal Publications
Singly and multiply charged ion yield curves are reported for resonant and nonresonant two photon- ionization processes for a collection of 31 metal atoms. The atoms are created by sputtering from a solid target using an Ar-ion gun. Single and multiple ionization of these atoms is performed using linearly polarized 248.6-nm (KrF) laser pulses with a full width at half maximum duration of 500 fs, employing intensities between 109 and 1012 W cm-2. A four-grid high-resolution reflecting time-of-flight spectrometer is used for ion detection. This advanced spectrometer has a well-defined and small source volume, enabling absolute …
Self-Calibrating Method For Measuring Local Multiphotonionization Yields As A Function Of Absolute Intensity, Cornelis J. Uiterwaal, B. Witzel, H. Schröder, K.-L. Kompa
Self-Calibrating Method For Measuring Local Multiphotonionization Yields As A Function Of Absolute Intensity, Cornelis J. Uiterwaal, B. Witzel, H. Schröder, K.-L. Kompa
C.J.G.J. Uiterwaal Publications
We present a self-calibrating method for measuring local multiphoton-ionization yields as a function of absolute intensity. In contrast to the method recently described by Walker et al. [Phys. Rev. A 57, R701 (1998)], our method does not require any assumption on the intensity distribution inside a laser focus, nor does it use any mathematical procedure such as deconvolution that would be based on such an assumption. In this sense, our method is self-calibrating. The proposed method immediately gives ion yields as a function of absolute intensity. Furthermore, it allows the intensity distribution inside the focal volume to be measured with …
Generalized Multiphoton-Ionization Cross Sections Of The Rare Gases For 500-Fs, 248.6-Nm Pulses, Cornelis J. Uiterwaal, D. Xenakis, D. Charalambidis, P. Maragakis, H. Schröder, P. Lambropoulus
Generalized Multiphoton-Ionization Cross Sections Of The Rare Gases For 500-Fs, 248.6-Nm Pulses, Cornelis J. Uiterwaal, D. Xenakis, D. Charalambidis, P. Maragakis, H. Schröder, P. Lambropoulus
C.J.G.J. Uiterwaal Publications
Absolute values for the generalized multiphoton-ionization cross sections and saturation intensities of rare gases are reported for 500-fs, 248.6-nm pulses. For He, Ar, and Kr these values are experimentally determined from the intensity dependence of the ponderomotive shift for intensities comparable to and above the saturation intensity. The measured experimental cross sections [σ(5)He=(0.9+9-o.4)×10-152 cm10 s4, σ(4)Ar=(1.3+1-0.5)×10-116 cm8 s3, σ(5)Kr=(1.2+1.7-0.6)×10-82 cm6 s2, σ(3)Xe=(50-45+350)×10-82 cm …