“…For comparison, the Cr hollow cathode lamp spectrum was characterized by a fwhm value of 0.1 nm. As discussed later, the lineshifts of Cr emission are consistent with literature reports on ballistic compressor studies . There are, however, no data in the literature describing the linewidth of Cr emission under conditions approximating those within a cavitation bubble.…”
Section: Resultssupporting
confidence: 87%
“…These data represent ballistic pressure measurements conducted at 3300 K and serve as the reference data against which our MBSL spectra will be compared. 3 Frequency shift of Cr atom emission lines from ballistic compression data at 3300 K …”
Section: Resultsmentioning
confidence: 99%
“…As discussed later, the lineshifts of Cr emission are consistent with literature reports on ballistic compressor studies. 15 There are, however, no data in the literature describing the linewidth of Cr emission under conditions approximating those within a cavitation bubble. The emission under a helium atmosphere is clearly different than that observed under an argon atmosphere, which is also consistent with the behavior observed for other metals in ballistic compressors.…”
Section: Resultsmentioning
confidence: 99%
“…The lineshifts observed in Figure 4 were compared to the published ballistic compression data, 15 which are reported in terms of argon density, relative to that at 298 K and 1 atm. The MBSL pressure was determined by scaling from ambient temperature using the ideal gas law to the known temperature of chromium MBSL in silicone oil saturated with argon (4700 K).…”
Section: Resultsmentioning
confidence: 99%
“…The red shift of the lines constituting the Cr triplet at 27 800 cm -1 lines, as a function of the relative density of argon, is shown in Figure 3 (similar data for the triplet at 23 300 cm -1 are also available). 15 These data represent ballistic pressure measurements conducted at 3300 K and serve as the reference data against which our MBSL spectra will be compared.…”
Multibubble sonoluminescence (MBSL) spectra were collected from solutions containing volatile metalcontaining compounds in silicone oil saturated with helium or argon. Ultrasonic irradiation of these solutions at 20 kHz and 90 W/cm 2 led to emission from excited states of the free metal atoms. The widths and peak positions of these lines varied as a function of the gas used to saturate the solution, indicating that the emission was from the gas phase of the bubble. High-resolution MBSL spectra showed that the pressure within the bubble at the point of emission was on the order of 300 bar in argon-saturated silicone oil, which is consistent with simple adiabatic compression during cavitation.
“…For comparison, the Cr hollow cathode lamp spectrum was characterized by a fwhm value of 0.1 nm. As discussed later, the lineshifts of Cr emission are consistent with literature reports on ballistic compressor studies . There are, however, no data in the literature describing the linewidth of Cr emission under conditions approximating those within a cavitation bubble.…”
Section: Resultssupporting
confidence: 87%
“…These data represent ballistic pressure measurements conducted at 3300 K and serve as the reference data against which our MBSL spectra will be compared. 3 Frequency shift of Cr atom emission lines from ballistic compression data at 3300 K …”
Section: Resultsmentioning
confidence: 99%
“…As discussed later, the lineshifts of Cr emission are consistent with literature reports on ballistic compressor studies. 15 There are, however, no data in the literature describing the linewidth of Cr emission under conditions approximating those within a cavitation bubble. The emission under a helium atmosphere is clearly different than that observed under an argon atmosphere, which is also consistent with the behavior observed for other metals in ballistic compressors.…”
Section: Resultsmentioning
confidence: 99%
“…The lineshifts observed in Figure 4 were compared to the published ballistic compression data, 15 which are reported in terms of argon density, relative to that at 298 K and 1 atm. The MBSL pressure was determined by scaling from ambient temperature using the ideal gas law to the known temperature of chromium MBSL in silicone oil saturated with argon (4700 K).…”
Section: Resultsmentioning
confidence: 99%
“…The red shift of the lines constituting the Cr triplet at 27 800 cm -1 lines, as a function of the relative density of argon, is shown in Figure 3 (similar data for the triplet at 23 300 cm -1 are also available). 15 These data represent ballistic pressure measurements conducted at 3300 K and serve as the reference data against which our MBSL spectra will be compared.…”
Multibubble sonoluminescence (MBSL) spectra were collected from solutions containing volatile metalcontaining compounds in silicone oil saturated with helium or argon. Ultrasonic irradiation of these solutions at 20 kHz and 90 W/cm 2 led to emission from excited states of the free metal atoms. The widths and peak positions of these lines varied as a function of the gas used to saturate the solution, indicating that the emission was from the gas phase of the bubble. High-resolution MBSL spectra showed that the pressure within the bubble at the point of emission was on the order of 300 bar in argon-saturated silicone oil, which is consistent with simple adiabatic compression during cavitation.
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