B S Dassanayake

Transmission Of Fast Highly Charged Ions Through A Single Glass Macrocapillary

The transmission of 3 MeV protons and 16 MeV O5+ ions through a single cylindrically‐shaped insulating macrocapillary glass has been investigated in a preliminary study. The capillary had a diameter du2009=u20090.18u2009mm and length lu2009=u200914.4u2009mm, giving an aspect ratio l/du2009=u200980. The sample was mounted on a goniometer to permit precise positioning with respect to the incident beam direction. Results show that 3 MeV protons transmit through the capillary without energy loss at small tilt angles (near zero), and the 16 MeV O5+ ions show transmission through the sample also with little energy loss at the same small tilt angles and little change in their charge state (∼1%). For a larger tilt angle (=u20091.5°), appreciable losses in energy occurred for incident O5+ and the ions changed their charge state up to 7+.

Electron transmission through a single glass macrocapillary: dependence on energy and time

The transmission of electrons through an insulating single cylindrically shaped glass capillary of macroscopic dimensions has been investigated for electron energies from 300 to 1000 eV using a hig ...

Guiding of electrons through a single glass macrocapillary: investigation of the time dependent transmission

The time dependence of electron transmission through a single, straight glass macrocapillary was investigated for 500-800 eV electrons. We show the time evolution of the transmitted electrons reveals characteristics different from the observation in the case of electron and ion guiding through insulating nanocapillary foils.

Broadening in the energy distribution of electron beams transmitted through a micrometer-sized tapered glass capillary

The transmission of electrons through a tapered glass capillary was observed for 1000 eV incident electrons up to tilt angles of ~9.5°. Tilt angle dependence of the energy loss broadening shows clear correspondence of elastic and inelastic processes. Both were found for smaller tilt angles.

Electron Transmission through Polycarbonate Nanocapillaries

Transmission of electrons through a polycarbonate nanocapillary foil with diameter 200 nm and aspect ratio ~ 40 has been studied at energies 500 and 1000 eV. The direct transmission of electrons was observed for both energies while onset of guiding was observed for 500 eV. Time (charge) evolution measurements were also carried out at different sample tilt angles.

Production of narrow electron beams using glass optics

Transmission of 300-1000 eV electrons through a single cylindrically-shaped glass capillary was studied. Transmitted electron intensities revealed three distinct regions with different characteristics depending on the mechanism of electron transmission.

Transmission of Fast Highly Charged Ions through a Single Glass Macrocapillary and Polycarbonate Nanocapillary Foils

Transmission of 3 MeV protons and 16 MeV O5+ ions through a single glass macrocapillary and a polycarbonate nanocapillary foil has been investigated. Results show that 3 MeV protons transmit through the capillary and the foils with little or no energy loss, while 16 MeV O5+ ions show transmission through the capillary and the foil with energy losses that vary with the tilt angle, and there are also changes in the charge state.

Angular and time dependence of electron transmission through a macroscale tapered glass capillary

The transmission of electrons through a tapered glass capillary was observed for 500, 800 and 1000 eV incident electrons up to about ~1?. No significant energy loss was found for the sample tilt angles investigated. The guiding ability of electrons was found to decrease with increasing energy. Time evolution measurements reveal unstable transmission through the capillary consistent with sudden bursts of elastic transmissions.

Transmission of fast highly charged ions through Al2O3 and PET nanocapillaries

Transmission of 16 MeV O5+ ions through Al2O3 and PET nanocapillary foils has been investigated. We find that O5+ is transmitted without energy loss for both foils, with little evidence of transmission for other charge states. However, for the PET foil at a detector position slightly displaced from the transmitted O5+ peak, we find large intensities of transmitted ions that have lost considerable energy. It is speculated that these peaks are due to nearly head-on collisions of the incident O5+ ions with carbon and hydrogen atoms in the PET sample.

Energy dependence of electron transmission through a single glass capillary

The transmission of electrons through a single glass capillary with incident energies of 300, 500, 800 and 1000 eV was studied. The results reveal two distinctly different transmission characteristics depending on the tilt angle of the capillary with respect to the incident beam and the incident energy. For small tilt angles ( ~ 2.5o) the rate decreases with increasing energy. These observations suggest that fundamentally different phenomena govern the electron transmission in these two regions.