Optical Absorption of Liquid Water in the Vacuum Ultraviolet

1972 ◽  
Vol 57 (1) ◽  
pp. 583-584 ◽  
Author(s):  
B. L. Sowers ◽  
R. D. Birkhoff ◽  
E. T. Arakawa
Keyword(s):  
Optical Absorption ◽  
Liquid Water ◽  
Vacuum Ultraviolet

One Electron Transitions in the Haloforms

1986 ◽  
Vol 41 (9) ◽  
pp. 1091-1093 ◽  
Author(s):  
R. Tate ◽  
D. C. Driscoll ◽  
G. Stauf
Keyword(s):  
Synchrotron Radiation ◽  
Optical Absorption ◽  
Light Source ◽  
Vacuum Ultraviolet ◽  
Electron Transitions ◽  
Electron Excitations ◽  
Absorption Features

We have investigated the optical absorption of CHCl3, CHBr3, and CHI3 in the vacuum ultraviolet, using synchrotron radiation as the light source. A number of absorption features have been observed and are assigned to n - σ*, n - s, n - p, and n - d, one electron excitations.

scholarly journals Liquid water absorption and scattering effects in DOAS retrievals over oceans

2014 ◽  
Vol 7 (12) ◽  
pp. 4203-4221 ◽  
Author(s):  
E. Peters ◽  
F. Wittrock ◽  
A. Richter ◽  
L. M. A. Alvarado ◽  
V. V. Rozanov ◽  
...  
Keyword(s):  
Optical Absorption ◽  
Water Absorption ◽  
Cross Section ◽  
Absorption Spectroscopy ◽  
Cross Sections ◽  
Liquid Water ◽  
Natural Waters ◽  
Differential Optical Absorption Spectroscopy ◽  
Optical Absorption Spectroscopy ◽  
Offset Correction

Abstract. Spectral effects of liquid water are present in absorption (differential optical absorption spectroscopy – DOAS) measurements above the ocean and, if insufficiently removed, may interfere with trace gas absorptions, leading to wrong results. Currently available literature cross sections of liquid water absorption are provided in coarser resolution than DOAS applications require, and vibrational Raman scattering (VRS) is mostly not considered, or is compensated for using simulated pseudo cross sections from radiative transfer modeling. During the ship-based TransBrom campaign across the western Pacific in October 2009, MAX-DOAS (Multi-AXis differential optical absorption spectroscopy) measurements of light penetrating very clear natural waters were performed, achieving average underwater light paths of up to 50 m. From these measurements, the retrieval of a correction spectrum (H2Ocorr) is presented, compensating simultaneously for insufficiencies in the liquid water absorption cross section and broad-banded VRS structures. Small-banded structures caused by VRS were found to be very efficiently compensated for by the intensity offset correction included in the DOAS fit. No interference between the H2Ocorr spectrum and phytoplankton absorption was found. In the MAX-DOAS tropospheric NO2 retrieval, this method was able to compensate entirely for all liquid water effects that decrease the fit quality, and performed better than using a liquid water cross section in combination with a simulated VRS spectrum. The decrease in the residual root mean square (rms) of the DOAS fit depends on the measurement's contamination with liquid water structures, and ranges from ≈ 30% for measurements slightly towards the water surface to several percent in small angles above the horizon. Furthermore, the H2Ocorr spectrum was found to prevent misfits of NO2 slant columns, especially for very low NO2 scenarios, and thus increases the reliability of the fit. In test fits on OMI satellite data, the H2Ocorr spectrum was found selectively above ocean surfaces, where it decreases the rms by up to ≈ 11%.

Optical Absorption and Vacuum-Ultraviolet Reflectance of GaN Thin Films

1970 ◽  
Vol 24 (25) ◽  
pp. 1421-1423 ◽  
Author(s):  
B. B. Kosicki ◽  
R. J. Powell ◽  
J. C. Burgiel
Keyword(s):  
Thin Films ◽  
Optical Absorption ◽  
Vacuum Ultraviolet ◽  
Ultraviolet Reflectance

scholarly journals Infrared spectroscopy of neutral water clusters at finite temperature: Evidence for a noncyclic pentamer

2020 ◽  
Vol 117 (27) ◽  
pp. 15423-15428 ◽  
Author(s):  
Bingbing Zhang ◽  
Yong Yu ◽  
Yang-Yang Zhang ◽  
Shukang Jiang ◽  
Qinming Li ◽  
...  
Keyword(s):  
Hydrogen Bonding ◽  
Infrared Spectra ◽  
Liquid Water ◽  
Vacuum Ultraviolet ◽  
Water Clusters ◽  
Bulk Water ◽  
Infrared Spectroscopic Study ◽  
Stretching Vibration ◽  
Hydrogen Bonding Networks ◽  
Neutral Water

Infrared spectroscopic study of neutral water clusters is crucial to understanding of the hydrogen-bonding networks in liquid water and ice. Here we report infrared spectra of size-selected neutral water clusters, (H2O)n(n= 3−6), in the OH stretching vibration region, based on threshold photoionization using a tunable vacuum ultraviolet free-electron laser. Distinct OH stretch vibrational fundamentals observed in the 3,500−3,600-cm−1region of (H2O)5provide unique spectral signatures for the formation of a noncyclic pentamer, which coexists with the global-minimum cyclic structure previously identified in the gas phase. The main features of infrared spectra of the pentamer and hexamer, (H2O)n(n= 5 and 6), span the entire OH stretching band of liquid water, suggesting that they start to exhibit the richness and diversity of hydrogen-bonding networks in bulk water.

Electronic Properties of Liquid Water in the Vacuum Ultraviolet

1968 ◽  
Vol 21 (5) ◽  
pp. 282-284 ◽  
Author(s):  
L. Robinson Painter ◽  
R. N. Hamm ◽  
E. T. Arakawa ◽  
R. D. Birkhoff
Keyword(s):  
Electronic Properties ◽  
Liquid Water ◽  
Vacuum Ultraviolet

Structural imperfections in silicon dioxide films identified with vacuum ultraviolet optical absorption measurements

1991 ◽  
Vol 59 (5) ◽  
pp. 528-530 ◽  
Author(s):  
Koichi Awazu ◽  
Hiroshi Kawazoe ◽  
Yasutoshi Saito ◽  
Kikuo Watanabe ◽  
Toshio Ando
Keyword(s):  
Optical Absorption ◽  
Silicon Dioxide ◽  
Vacuum Ultraviolet ◽  
Silicon Dioxide Films ◽  
Structural Imperfections ◽  
Absorption Measurements
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