scholarly journals Optical nanoscopy with excited state saturation at liquid helium temperatures

2015 ◽  
Vol 9 (10) ◽  
pp. 658-662 ◽  
Author(s):  
B. Yang ◽  
J.-B. Trebbia ◽  
R. Baby ◽  
Ph. Tamarat ◽  
B. Lounis
Keyword(s):  
Excited State ◽  
Liquid Helium ◽  
State Saturation

scholarly journals 3D optical nanoscopy with excited state saturation at liquid helium temperatures

2019 ◽  
Vol 27 (16) ◽  
pp. 23486 ◽  
Author(s):  
J.-B. Trebbia ◽  
R. Baby ◽  
P. Tamarat ◽  
B. Lounis
Keyword(s):  
Excited State ◽  
Liquid Helium ◽  
State Saturation

A method for imaging of low pH in live cells based on excited state saturation

2009 ◽  
Vol 77 (1) ◽  
pp. 98-101 ◽  
Author(s):  
Martin Beutler ◽  
Susanne Hinck ◽  
Dirk de Beer
Keyword(s):  
Excited State ◽  
Low Ph ◽  
Live Cells ◽  
State Saturation

Effective Masses of Quasifree Electrons in Inert Gas Solids

1974 ◽  
Vol 52 (20) ◽  
pp. 2062-2064
Author(s):  
R. G. Brown ◽  
H. T. Davis
Keyword(s):  
Excited State ◽  
Liquid Helium ◽  
Potential Barrier ◽  
Ground State ◽  
A Priori ◽  
Electronic Energy ◽  
Inert Gases ◽  
Inert Gas ◽  
Effective Masses ◽  
Ground State Energies

The Wigner–Seitz model for a core–core cutoff pseudopotential introduced by Springett et al. is used to predict effective masses of quasifree electrons in inert gas solids. The model has been useful in predicting or correlating ground state energies of electrons in liquid (Springett et al., Raz and Jortner, and Miyakawa and Dexter) and solid (Raz and Jortner) inert gases. The theoretical effective masses reported herein are at least a factor of two too high, even for Ne for which the model gives a good a priori prediction for the ground state quasifree electronic energy. The failure of the model in predicting excited state properties (namely, the effective masses) brings into question Miyakawa and Dexter's use of the potential barrier (Springett el al.) predicted by the same model in treating photoexcitation of electronic bubbles in liquid helium.

Renilla Bioluminescence: A Morphologic Approach to the Location of Photocytes

1974 ◽  
Vol 32 ◽  
pp. 208-209
Author(s):  
Ben O. Spurlock ◽  
Milton J. Cormier
Keyword(s):  
Excited State ◽  
Ground State ◽  
Molecular Basis ◽  
Light Emission ◽  
Chemical Basis ◽  
Electronic Excited State ◽  
Colonial Form ◽  
The Common ◽  
Eighteenth And Nineteenth Centuries ◽  
Catalyzed Oxidation

The phenomenon of bioluminescence has fascinated layman and scientist alike for many centuries. During the eighteenth and nineteenth centuries a number of observations were reported on the physiology of bioluminescence in Renilla, the common sea pansy. More recently biochemists have directed their attention to the molecular basis of luminosity in this colonial form. These studies have centered primarily on defining the chemical basis for bioluminescence and its control. It is now established that bioluminescence in Renilla arises due to the luciferase-catalyzed oxidation of luciferin. This results in the creation of a product (oxyluciferin) in an electronic excited state. The transition of oxyluciferin from its excited state to the ground state leads to light emission.

A Superconducting Microscope

1971 ◽  
Vol 29 ◽  
pp. 10-11 ◽  
Author(s):  
R. E. Worsham ◽  
J. E. Mann ◽  
E. G. Richardson
Keyword(s):  
Liquid Helium ◽  
Focal Length ◽  
Vacuum System ◽  
Objective Lens ◽  
Electrical Instability ◽  
Radiation Shields ◽  
And Control ◽  
Thermal Oscillations ◽  
Flux Pump

This superconducting microscope, Figure 1, was first operated in May, 1970. The column, which started life as a Siemens Elmiskop I, was modified by removing the objective and intermediate lenses, the specimen chamber, and the complete vacuum system. The large cryostat contains the objective lens and stage. They are attached to the bottom of the 7-liter helium vessel and are surrounded by two vapor-cooled radiation shields.In the initial operational period 5-mm and 2-mm focal length objective lens pole pieces were used giving magnification up to 45000X. Without a stigmator and precision ground pole pieces, a resolution of about 50-100Å was achieved. The boil-off rate of the liquid helium was reduced to 0.2-0.3ℓ/hour after elimination of thermal oscillations in the cryostat. The calculated boil-off was 0.2ℓ/hour. No effect caused by mechanical or electrical instability was found. Both 4.2°K and 1.7-1.9°K operation were routine. Flux pump excitation and control of the lens were quite smooth, simple, and, apparently highly stable. Alignment of the objective lens proved quite awkward, however, with the long-thin epoxy glass posts used for supporting the lens.

Water accumulation as a function of temperature on specimens in an electron microscope cold stage

1986 ◽  
Vol 44 ◽  
pp. 114-115 ◽  
Author(s):  
M.K. Lamvik ◽  
D.A. Kopf ◽  
S.D. Davilla ◽  
J.D. Robertson
Keyword(s):  
Electron Microscope ◽  
Mass Loss ◽  
Liquid Helium ◽  
Liquid Nitrogen ◽  
Liquid Nitrogen Temperature ◽  
Liquid Helium Temperature ◽  
Helium Temperature ◽  
Cold Stage ◽  
Water Accumulation ◽  
Better Than

Last year we reported1 that there is a striking reduction in the rate of mass loss when a specimen is observed at liquid helium temperature. It is important to determine whether liquid helium temperature is significantly better than liquid nitrogen temperature. This requires a good understanding of mass loss effects in cold stages around 100K.

Integration of Core-Edge Spectroscopy Methods for the Study of Polymers

1996 ◽  
Vol 54 ◽  
pp. 154-155
Author(s):  
E. G. Rightor
Keyword(s):  
Excited State ◽  
Polymer Blends ◽  
Gas Phase ◽  
Spatial Resolution ◽  
High Spatial Resolution ◽  
Electronic States ◽  
Core Electron ◽  
Bulk Solids ◽  
Development Application

Core edge spectroscopy methods are versatile tools for investigating a wide variety of materials. They can be used to probe the electronic states of materials in bulk solids, on surfaces, or in the gas phase. This family of methods involves promoting an inner shell (core) electron to an excited state and recording either the primary excitation or secondary decay of the excited state. The techniques are complimentary and have different strengths and limitations for studying challenging aspects of materials. The need to identify components in polymers or polymer blends at high spatial resolution has driven development, application, and integration of results from several of these methods.

Examining the degradation of environmentally-daunting per- and poly-fluoroalkyl substances from a fundamental chemical perspective

2020 ◽  
Vol 22 (31) ◽  
pp. 17659-17667 ◽  
Author(s):  
Antonio H. da S. Filho ◽  
Gabriel L. C. de Souza
Keyword(s):  
Excited State

In this work, ground and excited-state properties were used as descriptors for probing mechanisms as well as to assess potential alternatives for tackling the elimination of per- and poly-fluoroalkyl substances (PFAS).

Dynamic adjustment of emission from both singlets and triplets: the role of excited state conformation relaxation and charge transfer in phenothiazine derivates

2021 ◽  
Author(s):  
Weidong Qiu ◽  
Xinyi Cai ◽  
Mengke Li ◽  
Liangying Wang ◽  
Yanmei He ◽  
...  
Keyword(s):  
Excited State ◽  
Charge Transfer ◽  
Intramolecular Charge Transfer ◽  
Dynamic Adjustment ◽  
Twisted Intramolecular Charge Transfer

Dynamic adjustment of emission behaviours by controlling the extent of twisted intramolecular charge transfer character in excited state.

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