ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    Photochemistry of BrNCO and INCO (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 90 (1989), S. 171-176 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The absorption spectra of BrNCO and INCO in the region 160–400 nm are continuous in nature, and photolysis of these molecules with pulsed excimer lasers leads to dissociation. Photolysis of BrNCO and INCO at 308 and 351 nm, respectively, produces vibrationally cold ground state NCO radicals. Weak NCO A 2Σ+→X 2Π emission results from two-photon absorption processes at these wavelengths. Photolysis of BrNCO and INCO at 193 and 222 nm, respectively, produces intense NCO A 2Σ+→X 2Π emission. The NCO(A) is a direct one-photon photofragment in each case, and has considerable vibrational excitation. The yield of NCO(A) from BrNCO photolysis at 193 nm is approximately 16%; the yield of NCO(A) from INCO photolysis at 222 nm is near 13%. From the production of NCO(A) at these wavelengths and the short wavelength limit of the NCO A 2Σ+→X 2Π emission, limits on the heats of formation of these molecules are found to be ΔHf(BrNCO)≥−1.7 kcal mol−1 and ΔHf(INCO)≥10.9 kcal mol−1. These results demonstrate the preference of the halogen isocyanates for dissociation to doublet fragments by scission of the nitrogen–halogen bond, in contrast to the analogous halogen azides which photodissociate to singlet or triplet fragments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.456510
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Photochemistry of ClNCO (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 89 (1988), S. 4082-4085 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The gas phase chemistry that occurs after the photolysis of ClNCO at 248 nm is characterized by the action of two excited intermediates, N(2 D) and N2 (A). Each of these reacts with ClNCO to generate NCO(A 2 Σ+ ), and blue emission from the NCO(A 2 Σ+ →X 2 Π) transition is observed. The time profile of the NCO emission consists of two distinct components, a fast component arising from the N(2D)+ClNCO reaction and a slow component arising from the N2 (A)+ClNCO reaction. The N(2 D) is an initial photofragment and the N2(A) is generated in the N(2 D)+ClNCO reaction. The value of the rate constant for N(2D)+ClNCO is determined to be 7.0±0.8×10−11 cm3 s−1. The rate constant measured from the decay of the NCO emission in a previous work (2.1±0.2×10−11 cm3 s−1) is assigned to the N2(A)+ClNCO reaction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.454843
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Review of diagnostic methods for TFTR D–T radiation shielding and neutronics studies : Proceedings of the eleventh topical conference on high temperature plasma diagnostics (1997)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 68 (1997), S. 557-560 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The methods and instrument systems used for TFTR D–T radiation shielding and neutronics studies involving signal strengths ranging over 10 orders of magnitude are reviewed. Neutron and gamma dose-equivalent, fluence, spectral, and materials activation measurements have been performed at various locations from the TFTR vessel to the nearest property lines. The detection systems include 3He, BF3, and 235U proportional counters in moderated spheres, Bonner sphere arrays, advanced thermoluminescent detectors, argon ionization chambers, intrinsic Ge gamma detectors, and activation foil spectrometry methods. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1147652
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Impact of radiation measurements on hardening of TFTR diagnostics : Eighth topical conference on high—temperature plasma diagnostics (1990)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 61 (1990), S. 3256-3258 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Contrary to previous plans for the preparation of diagnostic systems for D-T break-even experiments in the Tokamak Fusion Test Reactor (TFTR), it now appears that a limited Q∼1 demonstration can be carried out without constructing a close-fitting igloo radiation shield around the tokamak. In order to assess the impact of D-T operation of TFTR without an igloo shield, particularly with regard to hardening of diagonstic systems, we have mapped neutron and gamma fluxes inside the test cell and test cell basement, using a variety of radiation measurements. The measurements are sufficiently detailed to resolve massive hardware components, such as neutral beams and shielded diagnostic systems, and can be used to predict local fluxes. By comparing the measurements with transport code calculations for the case of a bare tokamak, we conclude that the models have substantially overestimated fluxes both inside and outside the TFTR shield walls. It may be possible to eliminate an igloo shield, by taking credit for the shielding effectiveness of massive hardware around the tokamak. However, this will increase the need for local diagnostic shielding.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1141659
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...