Atomic near-infrared noble gas scintillations I

Lindblom, Peter; Solin, Olof

doi:10.1016/0168-9002(88)90607-9

Cited by 44 publications

(65 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The most striking feature of the emission spectrum at all studied pressures is the dominant atomic emission from the transitions 3p 5 4p-3p 5 4s between 696.5 and 978.5 nm in accordance with Lindblom and Solin [7]. The relative intensities of these lines depend on pressure.…”

Section: Atomic Emission Figures 2(a) and (B)supporting

confidence: 83%

Classification of Simple Graded Lie Algebras With Nonsemisimple Component $ L_0$

Кузнецов¹

1990

Math. USSR Sb.

View full text Add to dashboard Cite

The pressure dependence of the decay of the Ar(3p 5 4p) states excited by an energetic pulsed ion beam was studied in the pressure range 5-1600 kPa. All of the ten 3p 5 4p states have a fast build-up component and, with the exception of the 2p 1 state, two decay components: one fast (3-18 ns at 100 kPa) and one slow (20-300 ns at 100 kPa). Extrapolation of the fast decay rates to zero pressure yields the natural lifetimes of the states to values within the accuracy of the measurements. Most of the slow decays show nonlinear pressure dependencies. This nonlinearity is probably due to several competing processes. The slow decay of the 2p 3 -2p 5 states can be associated with the fast decay of the 2p 2 state. The pressure dependency of the 2p 2 state is considerably different from the other states within the 3p 5 4p configuration. It is concluded that the build-up of the 2p 2 state is associated with dissociative recombination of Ar + 2 and Ar 2+ 3 molecules. ¶

show abstract

Section: Atomic Emission Figures 2(a) and (B)supporting

confidence: 83%

Classification of Simple Graded Lie Algebras With Nonsemisimple Component $ L_0$

Кузнецов¹

1990

Math. USSR Sb.

View full text Add to dashboard Cite

show abstract

“…11, the main part of the scintillation photons is in the second continuum and the intensity of scintillation in the third continuum is negligible. It has been reported that there are no scintillation photons in rare gases in the visible region [10] in the pressure region above atmospheric pressure. From this figure and [10], it may be understood that the scintillation photon in rare gases is emitted from an excited dimmer in this pressure range.…”

Section: B Measurement Of Luminescence Spectrummentioning

confidence: 99%

Absolute number of scintillation photons emitted by alpha particles in rare gases

Saito

Tawara

Sanami

et al. 2002

IEEE Trans. Nucl. Sci.

View full text Add to dashboard Cite

To determine absolute scintillation yields due to alpha particles in high-pressure rare gases, the number of scintillation photons was measured using a vacuum ultraviolet (VUV) sensitive photodiode with spectral quantum efficiency ( ) measured as a function of wavelength . The absolute number of photoelectrons from the photocathode pe was measured using a charge-sensitive preamplifier calibrated with respect to charge number. The collection efficiency for scintillation photons ce at the photocathode was determined from the solid angle subtended by the photocathode at a scintillation point under the condition that there are no photons reflected off the surrounding walls. was determined from = pe ( ce ), where is the average quantum efficiency calculated from ( ) and a relative intensity ( ) of scintillation in rare gases. We measured the luminescence spectra using a VUV monochromator of known efficiency in order to obtain ( ). Measurements were performed in gaseous argon, krypton, and xenon in the pressure range from 1.

show abstract

“…62 The first continuum is dominant over the second continuum at high values of E / p, and the second continuum dominates at low E / p. Many PMTs used in GPSC have their peak response in the near UV ͑300− 380 nm͒ to short vis range. 59,60 The intensity of the second positive band has been found to ͑i͒ increase with increasing admixture partial pressure up to concentrations of Ϸ0.1% and then decrease with increasing admixture concentration and ͑ii͒ increase with decreasing p at constant admixture concentration. 46,56,60,63,64 The presence of a small concentration ͑Ϸ0.1% -4 % ͒ of N 2 in an atomic gas, such as Ar, quenches the continuum emissions, described above, and gives rise to corresponding emission lines between 300 and 420 nm that are referred to as the second positive band.…”

Section: B Gaseous Proportional Scintillationmentioning

confidence: 95%

“…56 References 55 and 56 have demonstrated that in commercially pure Ar the second continuum occurs at a peak wavelength of 128 nm with FWHMs of 10-100 nm at pressures of 360-1130 torr, anode voltages of 500-2500 V, and reduced electric fields whereby charge multiplication did not occur. 59 Therefore, in order to efficiently detect scintillation photons generated in GPSC it is often desirable to convert the strong VUV emissions, such as those described above, to vis wavelengths using an appropriate wavelength shifting quenching gas such as N 2 . 62 The first continuum is dominant over the second continuum at high values of E / p, and the second continuum dominates at low E / p. Many PMTs used in GPSC have their peak response in the near UV ͑300− 380 nm͒ to short vis range.…”

Section: B Gaseous Proportional Scintillationmentioning

confidence: 99%

Gaseous scintillation detection and amplification in variable pressure scanning electron microscopy

Morgan

Phillips

2006

Journal of Applied Physics

View full text Add to dashboard Cite

Absolute charge calibration of scintillating screens for relativistic electron detection Rev. Sci. Instrum. 81, 033301 (2010); 10.1063/1.3310275Silicon photodiodes for low-voltage electron detection in scanning electron microscopy and electron beam lithography J.This work investigates the generation and detection of gaseous scintillation signals produced in variable pressure scanning electron microscopy through electron-gas molecule excitation reactions. Here a gaseous scintillation detection ͑GSD͒ system is developed to efficiently detect photons produced via excitation reactions in electron cascades. Images acquired using GSD are compared to those obtained using conventional gaseous secondary electron detection ͑GSED͒ and demonstrate that images rich in secondary electron ͑SE͒ contrast can be achieved using the gaseous scintillation signal. A theoretical model, based on existing Townsend theories, is developed. It describes the production and amplification of photon signals generated by cascading SEs, high energy backscattered electrons, and primary beam electrons. Photon amplification ͑the total number of photons produced per sample emissive electron͒ is then investigated and compared to conventional electronic amplification over a wide range of microscope operating parameters, scintillating imaging gases, and photon collection geometries. These studies revealed that argon gas exhibited the largest GSD gain, followed by nitrogen then water vapor, exactly opposite to the trend observed for electron amplification data. It was also found that detected scintillation signals exhibit larger SE signal-to-background levels compared to those of conventional electronic signals detected via GSED. Finally, dragging the electron cascade towards the light pipe assemblage of GSD systems, or electrostatic focusing, dramatically increases the collection efficiency of photons.

show abstract

Atomic near-infrared noble gas scintillations I

Cited by 44 publications

References 7 publications

Classification of Simple Graded Lie Algebras With Nonsemisimple Component $ L_0$

Classification of Simple Graded Lie Algebras With Nonsemisimple Component $ L_0$

Absolute number of scintillation photons emitted by alpha particles in rare gases

Gaseous scintillation detection and amplification in variable pressure scanning electron microscopy

Contact Info

Product

Resources

About