O(1<i>S</i>) yield from O3 photodissociation at 1700–2400 Å

Lee, L. C.; Black, G.; Sharpless, R. L.; Slanger, T. G.

doi:10.1063/1.439925

Cited by 18 publications

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“…From the comparison of signal intensities at the two photolysis wavelengths, we obtained the quantum yield values for O( 3 P ) formation in the photodissociation of O 3 , using the following expression: where Φ 3P (λ) is the O( 3 P ) quantum yield at a photolysis wavelength λ , S(λ) is the LIF intensity which is corrected by intensity variation of the VUV probe laser, I(λ) is the photon flux of the UV photolysis laser, σ(λ) is the O 3 absorption cross section reported by Malicet et al [1995], and Φ 3P (308) is the quantum yield for O( 3 P ) formation at 308 nm (0.21). The O( 1 D ) quantum yield as a function of wavelength is given by: At the photolysis wavelengths shorter than 237 nm, the formation of O( 1 S ) is energetically possible [ Okabe , 1978]: However, the dissociation process is spin‐forbidden and the upper limit for the O( 1 S ) quantum yield has been reported to be 0.1% between 170 and 240 nm [ Lee et al , 1980]. It is thus reasonable to ignore the contribution of the process between 230 and 237 nm.…”

Section: Resultsmentioning

confidence: 99%

Quantum yields of O(¹D) formation in the photolysis of ozone between 230 and 308 nm

et al. 2002

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Ozone molecules are photolyzed in the strong photoabsorption band of the Hartley band at 230–308 nm, and the O(3Pj) photofragments produced by the photolysis are detected directly by a technique of laser‐induced fluorescence around 130 nm. The quantum yield values for O(1D) formation in the photolysis of ozone at 297 ± 2 K are determined as a function of the photolysis wavelength, using the O(1D) quantum yield value of 0.79 at 308 nm as a reference. The O(1D) quantum yield values obtained are found to be almost independent of the photolysis wavelength over the Hartley band (∼0.91). The results are compared with the values measured previously using various experimental techniques and also with the recommendation values for use in atmospheric modeling. The effects of the present yield data on the O(1D) production rates from ozone photolysis in the stratosphere are evaluated. Impact of our new O(1D) quantum yield values on the stratospheric chemistry has also been explored using a one‐dimensional photochemical model. The smaller O(1D) production rates as compared to the latest NASA/JPL recommendation values are followed by changes in the efficiency of the chemical chain reactions involving HOx, NOx, and ClOx and result in the higher O3 concentrations throughout the stratosphere.

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Section: Resultsmentioning

confidence: 99%

Quantum yields of O(¹D) formation in the photolysis of ozone between 230 and 308 nm

et al. 2002

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“…The further improvements seen in the 2step_UVO2min and 4step_UVO1min samples may be ascribed, respectively, to a greater removal of oxygen vacancy defects under prolonged UVO annealing time and a more efficient removal of oxygen vacancy defects by UVO annealing from a thinner high-κ layer (since UVO anneal only affects the surface region of the high-κ [77]). The following mechanism is thought to be dominant in the photolysis of ozone [156].…”

Section: Topography and Localized Gate Leakage Densitymentioning

confidence: 99%

Nanoscale characterization of advanced high-?? gate dielectric stacks via scanning tunneling microscopy

Yew¹

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My sincere gratitude to my supervisor, Prof. Ang Diing Shenp from Nanyang Technological University (NTU), for his sound technical guidance, inspiring ideas, constructive discussions and constant encouragement throughout the course of my Ph.D research works. His immense knowledge in device physics, sharp analytical skills, effective writing skills, high research integrity and great passion in research have sparked my growing enthusiasm in research field. He is a kind and committed person, who is willing to spend time and patiently works things out with us whenever we faced difficulties in our works. Prof. D. S. Ang is more than a research supervisor to me; he has always provided me with invaluable advices, be it in research, career or life. I am very grateful and lucky to have the opportunity to work under Prof. D. S. Ang's supervision. I would like to express my sincere gratitude to Prof. Pey Kin Leong (during his tenure with NTU) for granting me access to the ultra-high vacuum scanning tunneling microscopy (UHV-STM) system and Dr. Ong Yi Ching (currently with TSMC Taiwan) for patiently training me in handling the UHV-STM system. She has been very kind to share her technical experience in the high-κ metal oxide characterization using STM. My appreciation to Dr. Lakshmi Kanta Bera for his technical advices on device fabrication process. This project is supported in part by the Singapore Ministry of Education under a research grant MOE2009-T2-1-050 and in part by the NTU.

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Photodissociation Dynamics of Small Molecules

Jackson¹,

Okabe²

1986

Advances in Photochemistry

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O(1S) yield from O3 photodissociation at 1700–2400 Å

Cited by 18 publications

References 13 publications

Quantum yields of O(¹D) formation in the photolysis of ozone between 230 and 308 nm

Quantum yields of O(¹D) formation in the photolysis of ozone between 230 and 308 nm

Nanoscale characterization of advanced high-?? gate dielectric stacks via scanning tunneling microscopy

Photodissociation Dynamics of Small Molecules

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O(1S) yield from O3 photodissociation at 1700–2400 Å

Cited by 18 publications

References 13 publications

Quantum yields of O(1D) formation in the photolysis of ozone between 230 and 308 nm

Quantum yields of O(1D) formation in the photolysis of ozone between 230 and 308 nm

Nanoscale characterization of advanced high-?? gate dielectric stacks via scanning tunneling microscopy

Photodissociation Dynamics of Small Molecules

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Quantum yields of O(¹D) formation in the photolysis of ozone between 230 and 308 nm

Quantum yields of O(¹D) formation in the photolysis of ozone between 230 and 308 nm