The relative intensities of vibrational fine structure in two-photon transitions

1991 ◽  
Vol 146 (1) ◽  
pp. 1-7 ◽  
Author(s):  
Charles S. Feigerle
Keyword(s):  
Fine Structure ◽  
Two Photon

Doppler-free two-photon spectroscopy of neon. III. Isotopic shift and fine structure for the 2p5 4d and 2p5 5s configurations

1979 ◽  
Vol 40 (12) ◽  
pp. 1139-1144 ◽  
Author(s):  
E. Giacobino ◽  
F. Biraben ◽  
E. de Clercq ◽  
K. Wohrer-Beroff ◽  
G. Grynberg
Keyword(s):  
Fine Structure ◽  
Isotopic Shift ◽  
Two Photon

Doppler-free two-photon absorption spectrum of cesium

1983 ◽  
Vol 61 (6) ◽  
pp. 940-948 ◽  
Author(s):  
M. S. O'Sullivan ◽  
B. P. Stoicheff
Keyword(s):  
Absorption Spectrum ◽  
Fine Structure ◽  
Photon Absorption ◽  
Saturated Absorption ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Quantum Defects ◽  
Ionization Limit

Doppler-free two-photon spectroscopy has been used to investigate the transitions n2S ← 62S (n = 9 to 54) and n2D3/2.5/2 ← 62S (n = 7 to 53), and saturated absorption for the quadrupole transitions 52D3/2.5/2 ← 62S. Wavelengths of these transitions have been measured to an accuracy of 1 part in 107, and term values, quantum defects, and fine structure splittings evaluated. Series formulae have been used with the term values to obtain the ionization limit 31406.6376 ± 0.0016 cm−1.

scholarly journals Chromatic micromaps in primary visual cortex

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Soumya Chatterjee ◽  
Kenichi Ohki ◽  
R. Clay Reid
Keyword(s):  
Fine Structure ◽  
Visual Cortex ◽  
Primary Visual Cortex ◽  
Calcium Imaging ◽  
Similar Response ◽  
Functional Architecture ◽  
Color Representation ◽  
Two Photon ◽  
Layer 2 ◽  
Spatial Content

AbstractThe clustering of neurons with similar response properties is a conspicuous feature of neocortex. In primary visual cortex (V1), maps of several properties like orientation preference are well described, but the functional architecture of color, central to visual perception in trichromatic primates, is not. Here we used two-photon calcium imaging in macaques to examine the fine structure of chromatic representation and found that neurons responsive to spatially uniform, chromatic stimuli form unambiguous clusters that coincide with blobs. Further, these responsive groups have marked substructure, segregating into smaller ensembles or micromaps with distinct chromatic signatures that appear columnar in upper layer 2/3. Spatially structured chromatic stimuli revealed maps built on the same micromap framework but with larger subdomains that go well beyond blobs. We conclude that V1 has an architecture for color representation that switches between blobs and a combined blob/interblob system based on the spatial content of the visual scene.

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