Schematic diagram of experimental arrangement. M1, M2, and M3 are mirrors; R.M. is a relocatable mirror, and B.S. is a 50% near IR beam splitter.
Relative photodiode detector signal of metastable Ar absorption temporal profile for a 100% Ar (top trace) and 80% Ar∕20% (bottom trace) at . To avoid saturating the metastable Ar absorption, the discharge for 100% Ar was at applied voltage and the 80% Ar∕20% was at . The signals were separately normalized to the base line signal level (no absorption) in each trace. The traces are ten sweep averages. Note that the time scale of the 80% Ar∕20% absorption trace is a factor of 10 smaller than the pure Ar trace.
Metastable Ar absorption spectra for 70% Ar∕30% at , applied voltage and the current . The dotted line is the experimental trace, and the solid line is a Voigt line-shape fit of the spectrum. The FSR etalon spectrum used for relative frequency calibration is shown at the bottom.
Resolved emission spectra from metastable Ar (, Paschen notation) and (top graph) and and (bottom graph) for 70% Ar∕30% at , applied voltage, and current.
Change in per pulse emission signal of metastable Ar (Ar750) and (Ar751) and first negative and second positive in 70% Ar∕30% at pressure. The solid points are excited-state OES signals from Ar, , and ; the open points are DLAS of metastable Ar. The signals are separately normalized at pulse repetition rate. The inset graph is the line-integrated metastable Ar density from the DLAS measurment.
Fraction of deposited energy for metastable Ar production in the DBD with 70% Ar∕30% at , applied voltage, pulse. The inset graph is the net power deposited in the mixed gas, discharge determined from the voltage and net current. Error bars are not shown but net power is a lower bound with an uncertainty of a factor of . Fractional energy deposited in metastable Ar production is determined from the net power and is an upper bound with similar uncertainty.
Electronic excitation threshold energies.
Article metrics loading...
Full text loading...