In this work we analyze the ablation dynamics of crystalline Si in the intense near field generated by a small dielectric particle located at the material surface when being irradiated with an infrared femtosecond laser pulse (800 nm, 120 fs). The presence of the particle (7.9 μm diameter) leads to a strong local enhancement (ca. 40 times) of the incoming intensity of the pulse. The transient o...

Recently a number of techniques have combined laser ablation with liquid capture for mass spectrometry spot sampling and imaging applications. The newly developed noncontact liquid-vortex capture probe has been used to efficiently collect material ablated by a 355 nm UV laser in a continuous flow solvent stream in which the captured material dissolves and then undergoes electrospray ionization....

Minimally invasive therapies (such as radiofrequency ablation) are becoming more commonly used in the United States for the treatment of hepatocellular carcinomas and liver metastases. Unfortunately, these procedures suffer from high recurrence rates of hepatocellular carcinoma ( approximately 34-55%) or metastases following ablation therapy. The ability to perform real-time temperature imaging...

av-node modification by catheter rf energy delivery is treatment of choice in the symptomatic patients with avnrt. this study included 30 patients with avnrt (19 women, 11 men). we did slow pathway ablation in 29 cases successfully. maximum effective energy delivery was 40 watts for 40 msec. 1:1 av conduction increased from 290±40 msec before ablation to 340±65 msec after ablation. also av-node...

In [RTTS11] we have presented a general introduction to the process of laser ablation, its simulation by the molecular dynamics method, and results for aluminium and a complex metallic alloy. Here we will concentrate on how drops or clusters and voids can be simulated which form during laser ablation. Laser ablation is a process where material is removed from the surface of a solid or liquid by...

In spite of the fact that more than five decades have passed since the invention of laser, some topics of laser-matter interaction still remain incompletely studied. One of such topics is plasma impact on the overall phenomenon of the interaction and its particular OPEN ACCESS Micromachines 2014, 5 1345 features, including influence of the laser-excited plasma re-radiation, back flux of energet...

The ablation rate expressed as the amount of removed material per laser shot was calculated for pure metal samples under different experimental conditions: laser fluence (1.3–16.7 J cm−2), buffer gas (air, He and Ar) and gas pressure (103 –10−5 mbar). Fluence values covered the range between the plasma threshold (~1–2 J cm−2 for most elements) and 16.7 J cm−2. The 581 nm output of an excimer-pu...

Ablation of silicon sample in air under irradiance single anddouble laser pulses with wavelengths 355 and 532 nm was studied by means ofoptical scanning electron microscopy, raman spectroscopy, profilometryof craters as well video registration plasma's plume radiationin time. Dependence specific sample's material removal on fluenceand time interval between coupled bichromatic wasestablished. Sp...

The end of the Pleistocene in Southwest Asia is widely known for emergence socially-complex hunter-gatherers—the Natufians—characterized by a rich material culture record, including elaborate burials. In comparison, human interments that predate Natufian are rare. discovery and excavation hut structure at 20,000-year-old Epipalaeolithic site Kharaneh IV eastern Jordan reveals remains an adult f...