Mass Spectral Fragmentation Patterns of 3,6-Dihydro-1,2-oxazines

Ion-trap measurements of electric-field noise near surfaces

“…Firstly, γ varied as a function of processing. Not only did γ change following different processing steps for trap [22]c, but initially measured values γ for the four different traps were different at a level significantly greater than the uncertainty on each individual point. This suggests that some -as yet unidentified -factors in trap preparation play a role.…”

“…All of the measurements discussed so far were made at room temperature. It has been suggested that, in cases where the source of electricfield noise for ion traps is due to thermally activated processes, one could expect such sources to freeze out at low temperatures, leading to a temperature-dependent value of α. Labaziewicz et al measured the value of α as a function of trap temperature for the lowest-frequency vibrational mode in a linear surface trap (trap [22]c i). The ion was 75 µm above the electrodes, which were made of gold on a crystal-quartz substrate.…”

“…9 Measured values of the temperature exponent, γ, for four different traps . Traps [22]a,b,d were measured only once at cryogenic temperatures. For trap [22]c five measurements were made.…”

“…Traps [22]a,b,d were measured only once at cryogenic temperatures. For trap [22]c five measurements were made. Following measurement i the trap was cycled from 7 K to 130 K, without breaking vacuum.…”

“…Consequently, while traps with very high heating rates at room temperature (e.g. [19]a,b in Fig. 8) see a very large reduction in heating rates when cooled to cryogenic temperatures (see [19]e,f in Fig.…”