Vibronic structure of the near-infrared and visible electronic transitions of 7,7,8,8-tetracyanoquinodimethane radical anion

1983 ◽  
Vol 87 (19) ◽  
pp. 3657-3664 ◽  
Author(s):  
Ines Zanon ◽  
Cesare Pecile
Keyword(s):  
Radical Anion ◽  
Near Infrared ◽  
Electronic Transitions ◽  
Vibronic Structure

Near-Infrared Spectrophotometry: A New Dimension in Clinical Chemistry

1992 ◽  
Vol 38 (9) ◽  
pp. 1623-1631 ◽  
Author(s):  
J W Hall ◽  
A Pollard
Keyword(s):  
Near Infrared ◽  
Serum Proteins ◽  
Clinical Laboratory ◽  
Clinical Chemistry ◽  
Electronic Transitions ◽  
Chemical Information ◽  
Pharmaceutical Chemical ◽  
Laboratory Measurements ◽  
Nondestructive Technique ◽  
Combination Bands

Abstract The near-infrared (NIR) spectral region (700-2500 nm) is a fertile source of chemical information in the form of overtone and combination bands of the fundamental infrared absorptions and low-energy electronic transitions. This region was initially perceived as being too complex for interpretation and consequently was poorly utilized. Advances in chemometric techniques that can extract massive amounts of chemical information from the highly overlapped, complex spectra have led to extensive use of NIR spectrophotometry (NIRS) in the food, agriculture, pharmaceutical, chemical, and polymer industries. The application of NIRS in clinical laboratory measurements is still in its infancy. NIRS is a simple, quick, nondestructive technique capable of providing clinically relevant analyses of biological samples with precision and accuracy comparable with the method used to derive the NIRS models. Analyses can be performed with little or no sample preparation and no reagents. The success of NIRS in any particular case is determined by the complexity of the sample matrix, relative NIR absorptivities of the constituents, and the wavelengths and regression technique chosen. We describe the general approach to data acquisition, calibration, and analysis, using serum proteins, triglycerides, and glucose as examples.

scholarly journals Electronic transitions of single silicon vacancy centers in the near-infrared spectral region

2012 ◽  
Vol 85 (24) ◽  
Author(s):  
Elke Neu ◽  
Roland Albrecht ◽  
Martin Fischer ◽  
Stefan Gsell ◽  
Matthias Schreck ◽  
...  
Keyword(s):  
Spectral Region ◽  
Near Infrared ◽  
Electronic Transitions ◽  
Infrared Spectral Region ◽  
Silicon Vacancy ◽  
Infrared Spectral

Near-Infrared Electronic Transitions of BiN

1994 ◽  
Vol 166 (2) ◽  
pp. 471-485 ◽  
Author(s):  
R. Breidohr ◽  
K.D. Setzer ◽  
O. Shestakov ◽  
E.H. Fink ◽  
W. Zyrnicki
Keyword(s):  
Near Infrared ◽  
Electronic Transitions

Absorption by Atmospheric Gases

1989 ◽  
Author(s):  
R. M. Goody ◽  
Y. L. Yung
Keyword(s):  
Lower Energy ◽  
Near Infrared ◽  
Energy Levels ◽  
Electronic Energy ◽  
Electronic Transitions ◽  
Digital Archives ◽  
Atmospheric Gases ◽  
Vibration Rotation ◽  
Level Of Understanding ◽  
Stratospheric Clouds

Digital archives offer the investigator an up-to-date analysis of an extensive and specialized literature. Periodic revisions are reported in the open literature and it seems unlikely that future investigators will attempt to use any other source where archives can provide the required data. For this reason, we shall confine our comments on permitted vibration-rotation transitions to describing the AFGL tape contents, but we shall add two areas not contained in it: first, electronic bands, and second, the related topics of forbidden transitions, collision-induced transitions, and polymer spectra. The AFGL tape lists data on one important set of electronic transitions, those giving rise to the near-infrared atmospheric bands of molecular oxygen. These bands behave in the same way as vibration rotation bands, except for the frequency displacement caused by the change in electronic energy and the symmetry conditions imposed by the electronic wave functions. Other electronic transitions usually involve larger differences between energy levels and cannot be understood as completely as the lower energy, vibrational and rotational transitions. Fortunately, visible and ultraviolet bands of importance for atmospheric problems are less complicated than vibration—rotation bands and they are usually less affected by state parameters. Atmospheric absorption calculations in the visible and ultraviolet spectrum are commonly made on the basis of empirical data without requiring the level of understanding developed in Chapters 3 and 4 for vibration-rotation bands. The altitude of unit optical depth for ultraviolet atmospheric bands is illustrated in Fig. 5.1. The intensity of solar radiation falls off rapidly with decreasing wavelength in the spectral region shown (the irradiance at 2000 Å compared to that at 3000 Å is 10-2 whereas at 1000 Å it is 10-5, see Appendix 9). For heating rate calculations at altitudes less than 100km, only O2 and O3 are important, except under special conditions when the atmosphere contains large amounts of volcanic aerosols, or polar stratospheric clouds at high latitudes. All of the absorptions shown in Fig. 5.1 are important for other reasons that do not directly concern us here.

Two singlet electronic transitions in the near infrared attributed to VO+

1984 ◽  
Vol 108 (2) ◽  
pp. 343-351 ◽  
Author(s):  
A.J. Merer ◽  
A.S-C. Cheung ◽  
A.W. Taylor
Keyword(s):  
Near Infrared ◽  
Electronic Transitions
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