| 1. |
- Engdahl, Anders, et al.
(författare)
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The Binary Complex Between Hydrogen Peroxide and Ozone: A Matrix Isolation Study.
- 2003
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Ingår i: Chemical Physics. - 0301-0104. ; 293:2, s. 203-209
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Tidskriftsartikel (refereegranskat)abstract
- The interaction between hydrogen peroxide and ozone has been studied in argon matrices using infrared spectroscopy. The spectra show that hydrogen peroxide forms a weak hydrogen bond to one of the end oxygens of ozone. A comparison is made with other ozone complexes.
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| 2. |
- Engdahl, Anders, et al.
(författare)
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The HOOH-HOO complex. A matrix isolation study
- 2004
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Ingår i: Physical Chemistry Chemical Physics. - : Royal Society of Chemistry (RSC). - 1463-9084. ; 6:4, s. 730-734
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Tidskriftsartikel (refereegranskat)abstract
- The peroxy radical forms a cyclic complex with hydrogen peroxide, with both entities acting as hydrogen bond donors and as hydrogen bond acceptors. The strength of the complex is very similar to that of the hydrogen peroxide dimer.
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| 3. |
- Engdahl, Anders, et al.
(författare)
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The vibrational spectrum of H2O3.
- 2002
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Ingår i: Science. - : American Association for the Advancement of Science (AAAS). - 1095-9203 .- 0036-8075. ; 295:5554, s. 482-483
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Tidskriftsartikel (refereegranskat)abstract
- This report presents positive infrared spectroscopic identification of H2O3, a higher oxide of hydrogen of importance for the understanding of the chain formation ability of atomic oxygen and a possible intermediate in hydrogen oxygen radical chemistry. All fundamental vibrations of H2O3, isolated in an argon matrix, have been observed. In addition, several bands of HDO3, D2O3, and H2(16)O2(18)O have been measured. One particular mode, the antisymetric O-O stretch at 776 cm-1, should be observable even in the presence of high water concentrations.
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| 4. |
- Engdahl, Anders, et al.
(författare)
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The water dimer in a too tight matrix cage
- 2002
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Ingår i: Physical Chemistry Chemical Physics. - : Royal Society of Chemistry (RSC). - 1463-9084 .- 1463-9076. ; 4:11, s. 2140-2143
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Tidskriftsartikel (refereegranskat)abstract
- When an argon matrix containing hydrogen peroxide dimer is irradiated with 266 nm radiation from a YAG laser, water forms. Some of it is formed as monomer but the main part is formed as dimer. The photogenerated water dimer is formed together with an oxygen molecule in the cage of the parent hydrogen peroxide dimer and the dimer bands are shifted from their normal positions indicating that the cage severely perturbs the product structure.
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| 5. |
- Engdahl, Anders, et al.
(författare)
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The water-hydroxyl radical complex: A matrix isolation study.
- 2003
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Ingår i: Journal of Chemical Physics. - : AIP Publishing. - 0021-9606 .- 1089-7690. ; 118:17, s. 7797-7802
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Tidskriftsartikel (refereegranskat)abstract
- The water–hydroxyl radical complex was prepared by irradiating peroxy radicals in hydrogen-doped argon matrices. The low water content of the matrices made it possible to observe the fundamental bands of the complexed water molecule. The experimental results are compared with the results from ab initio calculations. The complex rotates around the O–O axis in the matrix. ©2003 American Institute of Physics.
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| 6. |
- Hult, Peter, 1964-, et al.
(författare)
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An improved bioacoustic method for monitoring of respiration
- 2004
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Ingår i: Technology and Health Care. - 0928-7329 .- 1878-7401. ; 12:4, s. 323-332
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Tidskriftsartikel (refereegranskat)abstract
- Reliable monitoring of respiration plays an important role in a broad spectrum of applications. Today, there are several methods for monitoring respiration, but none of them has proved to be satisfactory in all respects. We have recently developed a bioacoustic method that can accurately time respiration from tracheal sounds. The aim of this study is to tailor this bioacoustic method for monitoring purposes by introducing dedicated signal processing. The method was developed on a material of ten patients and then tested in another ten patients treated in an intensive care unit. By studying the differences in the variation of the spectral content between the different phases of respiration, the described method can distinguish between inspiration and expiration and can extract respiration frequency, and respiration pause periods. The system detected 98% of the inspirations and 99% of the expirations. This method for respiration monitoring has the advantage of being simple, robust and the sensor does not need to be placed closed to the face. A commercial heart microphone was used and we anticipate that further improvement in performance can be achieved trough optimization of sensor design.
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