title: Ablation dynamics of Co/ZnS targets under double pulse femtosecond laser irradiation.
abstract: Femtosecond lasers, used as tools to investigate the ablation dynamics of solids, can help to develop strategies to control the deposition of nanomaterials by pulsed laser ablation. In this work, Co/ZnS targets, potential candidates for the synthesis of diluted magnetic semiconductor materials, are irradiated by sequences of two femtosecond laser pulses delayed in the picosecond time scale. The ionic composition of the ablation plasma and the dependence of the ion signals on the interpulse delay and relative fluence are determined by time-of-flight mass spectrometry. The results show that, when pulses of different fluence are used, highly asymmetric ion yields are obtained, with more intense ion signals detected when the lower fluence pulse is temporally ahead. The comparison between asymmetric and equal fluence double pulse ablation dynamics provides some understanding of the different processes that modify the properties of the layer irradiated by the first pulse and of the mechanisms affecting the coupling of the delayed pulse into the material. The final outcome of the double pulse irradiation is characterized through the analysis of the deposits produced upon ablation.
authors.affiliation: Instituto de Química Física Rocasolano, IQFR-CSIC, Serrano 119, 28006 Madrid, Spain. mmm@iqfr.csic.es.
authors.forename: Ignacio
authors.initials: I
authors.lastname: Lopez-Quintas
authors.affiliation: Instituto de Química Física Rocasolano, IQFR-CSIC, Serrano 119, 28006 Madrid, Spain. mmm@iqfr.csic.es.
authors.forename: Vincent
authors.initials: V
authors.lastname: Loriot
authors.affiliation: Departamento de Química Inorgánica I, Facultad de Ciencias Químicas, Universidad Complutense de Madrid, 28040 Madrid, Spain.
authors.forename: David
authors.initials: D
authors.lastname: Ávila
authors.affiliation: Departamento de Química Física I, (Unidad Asociada I+D+i al CSIC) and Centro de Láseres Ultrarrápidos Facultad de Ciencias Químicas, Universidad Complutense de Madrid, 28040 Madrid, Spain.
authors.forename: Jesus G
authors.initials: JG
authors.lastname: Izquierdo
authors.affiliation: Instituto de Química Física Rocasolano, IQFR-CSIC, Serrano 119, 28006 Madrid, Spain. mmm@iqfr.csic.es.
authors.forename: Esther
authors.initials: E
authors.lastname: Rebollar
authors.affiliation: Departamento de Química Física I, (Unidad Asociada I+D+i al CSIC) and Centro de Láseres Ultrarrápidos Facultad de Ciencias Químicas, Universidad Complutense de Madrid, 28040 Madrid, Spain.
authors.forename: Luis
authors.initials: L
authors.lastname: Bañares
authors.affiliation: Instituto de Química Física Rocasolano, IQFR-CSIC, Serrano 119, 28006 Madrid, Spain. mmm@iqfr.csic.es.
authors.forename: Marta
authors.initials: M
authors.lastname: Castillejo
authors.affiliation: Instituto de Química Física Rocasolano, IQFR-CSIC, Serrano 119, 28006 Madrid, Spain. mmm@iqfr.csic.es.
authors.forename: Rebeca
authors.initials: R
authors.lastname: de Nalda
authors.affiliation: Instituto de Química Física Rocasolano, IQFR-CSIC, Serrano 119, 28006 Madrid, Spain. mmm@iqfr.csic.es.
authors.forename: Margarita
authors.initials: M
authors.lastname: Martin