Uration, G.A., S.A.M.I. and also a.E.; writing–original draft preparation, H.O.T., A.A. and D.S.; writing–review and editing, H.M.H.Z., Z.S., E.R., S.A.M.I., G.K., O.B. and also a.E.; visualization, G.A., A.A. and D.S.; supervision, H.M.H.Z. and H.O.T.; project administration, Z.S., E.R., H.O.T., G.K., O.B. and S.A.M.I.; funding acquisition, A.E. All authors have study and agreed to the published version with the manuscript. Funding: This study was funded by the Deanship of Scientific Investigation at Princess Nourah bint Abdulrahman University by way of the Fast-track Analysis Funding Program.Components 2021, 14,ten ofInstitutional Critique Board Statement: Not applicable. Informed Consent Statement: Not applicable. Data Availability Statement: Information is contained inside the write-up. Acknowledgments: This study was funded by the Deanship of Scientific Investigation at Princess Nourah bint Abdulrahman University via the Fast-track Analysis Funding System. Authors expresses their due to “Dunarea de Jos” University of Galati, Romania for APC help. Conflicts of Interest: The authors declare no conflict of Seclidemstat References interest.materialsArticleThermochemical Laser-Induced Periodic Surface Leupeptin hemisulfate Inhibitor Structures Formation by Femtosecond Laser on Hf Thin Films in Air and VacuumDmitrij A. Belousov , Kirill A. Bronnikov , Konstantin A. Okotrub, Sergey L. Mikerin Vadim S. Terentyev and Alexander V. Dostovalov , Victor P. Korolkov ,Institute of Automation and Electrometry on the SB RAS, Novosibirsk State University, Academician Koptyug Ave. 1, Novosibirsk 630090, Russia; bronnikovkirill@gmail (K.A.B.); [email protected] (K.A.O.); [email protected] (S.L.M.); [email protected] (V.P.K.); [email protected] (V.S.T.) Correspondence: d.a.belousov91@gmail (D.A.B.); [email protected] (A.V.D.)Citation: Belousov, D.A.; Bronnikov, K.A.; Okotrub, K.A.; Mikerin, S.L.; Korolkov, V.P.; Terentyev, V.S.; Dostovalov, A.V. Thermochemical Laser-Induced Periodic Surface Structures Formation by Femtosecond Laser on Hf Thin Films in Air and Vacuum. Supplies 2021, 14, 6714. 10.3390/ma14216714 Academic Editor: Alexey Scherbakov Received: 27 September 2021 Accepted: four November 2021 Published: eight NovemberAbstract: Thermochemical laser-induced periodic surface structures (TLIPSS) are a reasonably new type of periodic structures formed inside the focal region of linear polarized laser radiation by the thermally stimulated reaction of oxidation. The higher regularity from the structures as well as the possibility of forming high-ordered structures over a sizable region open up possibilities for the sensible application for changing the optical and physical properties of supplies surface. Because the mechanism of formation of those structures is depending on a chemical oxidation reaction, an intriguing question requires the influence of air stress on the good quality of structure formation. This paper presents the outcomes on the TLIPSS formation on a thin hafnium film with fs IR laser radiation at many ambient air pressures from 4 Torr to 760 Torr. Despite the decrease in the oxygen content material inside the ambient atmosphere by two orders of magnitude, the formation of high-ordered TLIPSS (dispersion within the LIPSS orientation angle five) using a period of 700 nm occurs within a wide range of parameters variation (laser energy, scanning speed). This behavior of TLIPSS formation is in agreement with experimental data obtained earlier around the study on the kinetics of high-temperature oxidation of hafnium at numerous oxygen pressures. Keyword phrases:.