The reaction between the propargyl radical (C3H3) and NO has been investigated as a function of temperature
(195−473 K) and pressure (3−100 Torr) by using color center laser infrared kinetic spectroscopy. At room
temperature and below, the reaction rate was found to depend strongly on the helium buffer gas pressure and,
at any fixed buffer gas density, to decrease with increasing temperature. This behavior is consistent with the
reaction occurring by termolecular addition to produce C3H3NO. Data collected over a wide pressure range
at 195 and 296 K were fitted to a semiempirical model developed by Troe for reactions of this type. The
structure and energetics of the adduct were explored by performing both B3LYP 6-311++G(2df,2pd) and
G2 calculations. The enthalpy change, ΔH, for addition of NO to the CH end of propargyl was determined
as −123 and −138 kJ/mol, respectively, by using these two methods. The calculations also showed that NO
can add at the CH2 end of propargyl but with a smaller binding energy. Estimates of the equilibrium constant
for adduct formation, made using data obtained from these calculations, revealed that the addition reaction
should shift from an equilibrium position strongly favoring the adduct to one strongly favoring free propargyl
as the temperature is raised from 550 to 650 K. This temperature regime is higher than any of the temperatures
reached experimentally.
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We show for the first time that control of the crystalline phases of HfO 2 by tetravalent (Si) and trivalent (Y,Gd) dopants enables significant improvements in the capacitance equivalent thickness (CET) and leakage current in capacitors targeting deep trench (DT) DRAM applications. By applying these findings, we present a MIM capacitor meeting the requirements of the 40 nm node. A CET <1.3 nm was achieved at the deep trench DRAM thermal budget of 1000°C.
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