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Papers by Leonard Suess
APS, May 1, 2004
The dynamics of free-ion production through electron transfer in K(np)/CH3CN collisions are exami... more The dynamics of free-ion production through electron transfer in K(np)/CH3CN collisions are examined through measurements using velocity-selected Rydberg atoms. The data show that Rydberg electron transfer leads to the creation of two groups of dipole-bound CH3CN− ions, one long lived (τ>85 μs), the other short lived (τ<1 μs). The velocity dependences associated with the production of both groups of ions are similar, the ion formation rate decreasing markedly with decreasing Rydberg atom velocity, principally as a consequence of postattachment electrostatic interactions between the product ions. The results are in reasonable accord with the predictions of a Monte Carlo collision model that considers the effect of crossings between the diabatic potential curves for the covalent K(np)/CH3CN system and the K+/CH3CN− ion pair. This model also accounts for the relatively small reaction rate constants, ∼0.5–1.0×10−8 cm3 s−1, associated with the formation of long-lived CH3CN− ions. No velocity dependence in the lifetime of the CH3CN− ions is observed.
The Atmospheric Reentry Materials and Structures Evaluation Facility (ARMSEF) located at NASA Joh... more The Atmospheric Reentry Materials and Structures Evaluation Facility (ARMSEF) located at NASA Johnson Space Center is used for simulating the extreme environment experienced upon reentry for the development and certification of thermal protection systems (TPS). The facility supports a large variety of programs and was heavily leveraged for the certification and operational support of the TPS for the Orbiter and, more recently, the development of the heat shield for CEV. This paper will provide more detail into the heritage of the facility. Unique attributes of the facility include a modular aerodynamically stabilized arc heater and independently controlled O2 and N2 for the test gases. When combining the O2 and N2 in a 23:77 mass ratio respectively the Earth s atmosphere is accurately simulated and via modification of this ratio the investigation of the effects of atomic oxygen on a material s response is possible. In the summer of 2010 a development effort was started to add CO2 as...
54th AIAA Aerospace Sciences Meeting, Jan 2, 2016
42nd AIAA Thermophysics Conference, 2011
The Journal of Chemical Physics, 2004
The dynamics of free-ion production through electron transfer in K(np)/CH3CN collisions are exami... more The dynamics of free-ion production through electron transfer in K(np)/CH3CN collisions are examined through measurements using velocity-selected Rydberg atoms. The data show that Rydberg electron transfer leads to the creation of two groups of dipole-bound CH3CN− ions, one long lived (τ>85 μs), the other short lived (τ<1 μs). The velocity dependences associated with the production of both groups of ions are similar, the ion formation rate decreasing markedly with decreasing Rydberg atom velocity, principally as a consequence of postattachment electrostatic interactions between the product ions. The results are in reasonable accord with the predictions of a Monte Carlo collision model that considers the effect of crossings between the diabatic potential curves for the covalent K(np)/CH3CN system and the K+/CH3CN− ion pair. This model also accounts for the relatively small reaction rate constants, ∼0.5–1.0×10−8 cm3 s−1, associated with the formation of long-lived CH3CN− ions. N...
... by Leonard Suess Low-energy electron transfer between a Rydberg atom and a target molecule ca... more ... by Leonard Suess Low-energy electron transfer between a Rydberg atom and a target molecule can ... I am grateful to my parents, who have constantly pushed me to better myself. Most importantly, my deepest thanks go to my wife, Jessica. Her constant support ...
APS, May 1, 2004
The dynamics of free-ion production through electron transfer in K(np)/CH3CN collisions are exami... more The dynamics of free-ion production through electron transfer in K(np)/CH3CN collisions are examined through measurements using velocity-selected Rydberg atoms. The data show that Rydberg electron transfer leads to the creation of two groups of dipole-bound CH3CN− ions, one long lived (τ>85 μs), the other short lived (τ<1 μs). The velocity dependences associated with the production of both groups of ions are similar, the ion formation rate decreasing markedly with decreasing Rydberg atom velocity, principally as a consequence of postattachment electrostatic interactions between the product ions. The results are in reasonable accord with the predictions of a Monte Carlo collision model that considers the effect of crossings between the diabatic potential curves for the covalent K(np)/CH3CN system and the K+/CH3CN− ion pair. This model also accounts for the relatively small reaction rate constants, ∼0.5–1.0×10−8 cm3 s−1, associated with the formation of long-lived CH3CN− ions. No velocity dependence in the lifetime of the CH3CN− ions is observed.
The Atmospheric Reentry Materials and Structures Evaluation Facility (ARMSEF) located at NASA Joh... more The Atmospheric Reentry Materials and Structures Evaluation Facility (ARMSEF) located at NASA Johnson Space Center is used for simulating the extreme environment experienced upon reentry for the development and certification of thermal protection systems (TPS). The facility supports a large variety of programs and was heavily leveraged for the certification and operational support of the TPS for the Orbiter and, more recently, the development of the heat shield for CEV. This paper will provide more detail into the heritage of the facility. Unique attributes of the facility include a modular aerodynamically stabilized arc heater and independently controlled O2 and N2 for the test gases. When combining the O2 and N2 in a 23:77 mass ratio respectively the Earth s atmosphere is accurately simulated and via modification of this ratio the investigation of the effects of atomic oxygen on a material s response is possible. In the summer of 2010 a development effort was started to add CO2 as...
54th AIAA Aerospace Sciences Meeting, Jan 2, 2016
42nd AIAA Thermophysics Conference, 2011
The Journal of Chemical Physics, 2004
The dynamics of free-ion production through electron transfer in K(np)/CH3CN collisions are exami... more The dynamics of free-ion production through electron transfer in K(np)/CH3CN collisions are examined through measurements using velocity-selected Rydberg atoms. The data show that Rydberg electron transfer leads to the creation of two groups of dipole-bound CH3CN− ions, one long lived (τ>85 μs), the other short lived (τ<1 μs). The velocity dependences associated with the production of both groups of ions are similar, the ion formation rate decreasing markedly with decreasing Rydberg atom velocity, principally as a consequence of postattachment electrostatic interactions between the product ions. The results are in reasonable accord with the predictions of a Monte Carlo collision model that considers the effect of crossings between the diabatic potential curves for the covalent K(np)/CH3CN system and the K+/CH3CN− ion pair. This model also accounts for the relatively small reaction rate constants, ∼0.5–1.0×10−8 cm3 s−1, associated with the formation of long-lived CH3CN− ions. N...
... by Leonard Suess Low-energy electron transfer between a Rydberg atom and a target molecule ca... more ... by Leonard Suess Low-energy electron transfer between a Rydberg atom and a target molecule can ... I am grateful to my parents, who have constantly pushed me to better myself. Most importantly, my deepest thanks go to my wife, Jessica. Her constant support ...