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Volumn 79, Issue 20, 2009, Pages

Nitrogen 1s NEXAFS and XPS spectroscopy of NH3 -saturated Si(001)- 2×1: Theoretical predictions and experimental observations at 300 K

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EID: 67649130772     PISSN: 10980121     EISSN: 1550235X     Source Type: Journal    
DOI: 10.1103/PhysRevB.79.205317     Document Type: Article
Times cited : (21)

References (55)
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    • We could think of isocyanates (to form a urea linkage), acyl chlorides/acid anhydrides (to form amides), ketones/aldehydes (to form imines), whose reaction with amines could be tested at room temperature and under low gas pressure (in the range 10-9 - 10-7 mbar).
    • We could think of isocyanates (to form a urea linkage), acyl chlorides/acid anhydrides (to form amides), ketones/aldehydes (to form imines), whose reaction with amines could be tested at room temperature and under low gas pressure (in the range 10-9 - 10-7 mbar).
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    • The computation of the energy Hessian included in the GAMESS package (Ref. of the present paper) permits the prediction of vibrational frequencies.
    • The computation of the energy Hessian included in the GAMESS package (Ref. of the present paper) permits the prediction of vibrational frequencies.
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    • Changes in the calculated IP can be viewed as "final-state" effects: the relaxation energy, i.e. the ability of the system to screen out the nitrogen core hole, increases with the silicon cluster size. On the other hand, Mulliken charges in the ground state do not vary much with increasing the silicon cluster size [they amount to -0.71, -0.73 and -0.71unit charge for SiH3, Si (SiH3) 3, and Si9 H12, respectively].
    • Changes in the calculated IP can be viewed as "final-state" effects: the relaxation energy, i.e. the ability of the system to screen out the nitrogen core hole, increases with the silicon cluster size. On the other hand, Mulliken charges in the ground state do not vary much with increasing the silicon cluster size [they amount to -0.71, -0.73 and -0.71unit charge for SiH3, Si (SiH3) 3, and Si9 H12, respectively].
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    • As the calculation of the vibrational fine structure of the N 1s spectrum of paired amines was largely beyond the scope of the present paper, we have assumed here that we can sum two, split apart, components having the same width as that calculated for an isolated amine. As a matter of facts, the H bond between two amines is relatively weak (the N-N distance is in the range 3.3-3.55 Å). Stronger H bonds may have non-negligible effects on component widths. Indeed in the case of the water dimer (O-O distance of 2.91 Å, see Ref.), the hydrogen bonding and the drastic change in water-dimer potential under O 1s core ionization are responsible for an anomalously strong vibrational broadening of both the donor and acceptor oxygens. See 10.1016/j.chemphys.2004. 12.006
    • As the calculation of the vibrational fine structure of the N 1s spectrum of paired amines was largely beyond the scope of the present paper, we have assumed here that we can sum two, split apart, components having the same width as that calculated for an isolated amine. As a matter of facts, the H bond between two amines is relatively weak (the N-N distance is in the range 3.3-3.55 Å). Stronger H bonds may have non-negligible effects on component widths. Indeed in the case of the water dimer (O-O distance of 2.91 Å, see Ref.), the hydrogen bonding and the drastic change in water-dimer potential under O 1s core ionization are responsible for an anomalously strong vibrational broadening of both the donor and acceptor oxygens. See V. C. Felicíssimo, I. Minkov, F. F. Guimaraes, F. Gel'mukhanov, A. Cesar, and H. Ågren, Chem. Phys. 312, 311 (2005). 10.1016/j.chemphys.2004.12.006
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    • Felicíssimo, V.C.1    Minkov, I.2    Guimaraes, F.F.3    Gel'Mukhanov, F.4    Cesar, A.5    Ågren, H.6


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