Experimental results | Correspondence to model | Explanations and comments |
CL/SL/LIBL existence. | Fully compliant with the PeTa model. | It is necessary to have the number of the excited particles N ≥ 103 and N/V more than the threshold density of them. |
OBSL emission has light pulses of ~10−11 s duration. | Fully compliant with the PeTa model. | tс is equal to ~10−11 s if N (the quantity of particles in the cloud) is N ≥ 105. |
LIBL emission has light pulses of ~10−9 s duration, much more than CL/SL. | Does not contradict the PeTa model. | This is due to the relatively large volume of the bubble and the large number of particles N. |
Every flash of OBSL/LIBL emits 105 - 108 photons. | Fully compliant with the PeTa model. | It corresponds to N ≥ 106 - 109 particles in the cloud. |
The spectra of CL/SL/LIBL are large bands from IR, via visible, up to UV. | Fully compliant with the PeTa model. | The spectra are determined by the condensation of individual molecules and of clusters up to 36 molecules. |
The spectra of CL/SL/LIBL increase the intensity from IR, via visible, up to UV. | Fully compliant with the PeTa model. | Decrease of distances between individual peaks. |
In LIBL, the emission peak at 0.34 µm exists on the background of the main range. | Fully compliant with the PeTa model. | Existence in the protonated vapour of a large quantity of clusters with M = 21, the magic number of water molecules. |
Noble gases increase CL and SL intensities. | Fully compliant with the PeTa model. | Noble gases form clusters with water vapour up to 60 molecules. |
Intensity of CL and SL increases with decreasing liquid temperature. | Fully compliant with the PeTa model. | Two reasons: (1) the clusters in the water vapour are more stable at a low temperature; (2) it is easier to get a large supersaturation at lower temperatures. |
Both the pulse widths in the red and the ultraviolet spectral range are identical. | Fully compliant with the PeTa model. | The mechanism of light emission is the same for different wavelengths; only the quantity of molecules in the clusters is different. |
Bubble radii R0 are in the range ~2.3 μm - 2 mm. | Fully compliant with the PeTa model. | Two reasons: (1) Equation (19) is fulfilled; (2) for accommodation coefficient α = 0.1, during the expansion of the bubbles, these radii give a volume for the evaporation of liquid that is sufficient for N ≈ 107 particles in the cloud. |
Frequencies of liquid perturbations: 1 Hz - 1 HHz; the corresponding duration of one cycle 1 s - 1 × 10−6 s. | These values are within the PeTa model. | For accommodation coefficient α = 0.1, during expansion of the bubbles, these frequencies give time for the evaporation of liquid that is sufficient for N ≈ 107 particles in the cloud. |
There is some, but not too much, dissolved gas; degassing on ~20% from saturation. | Compliant with the PeTa model. | It gives a necessary pressure ratio of the gas and vapour in the bubble. |
Calibrated measurements of bubble brightness in OBSL show that each flash contains about Ep ≈ 1 × 10−12 J energy. | Fully compliant with the PeTa model. | Our estimation gives Ep ≈ (1 × 10−10 - 1 × 10−12) J of energy; energy absorption by the water and the walls of the vessel has to be taken into account. |
MBSL has a power of WSL ≈ 1.6 × 10−8 W from a volume of liquid ~ 6 × 10−5 m3, excited with 1 W of ultrasonic energy at 24 kHz. | It corresponds to the estimation for OBSL: WOBSL ≈ (10−7 - 10−4) W without taking into account any absorption; for MBSL, the number and sizes of emitting bubbles are unknown. | The absorption of radiation by liquid and glass or quartz must be taken into account. |
Existence of other than 0.34 µm emission peaks in the background of the main range. | Does not contradict the PeTa model. | It is likely that their presence is due to the excitation of gases and other substances dissolved in the liquid; their excitation occurs under the influence of shock waves occurring in the liquid. |
Flash occurs ~10−7 s before the minimum radius of the bubble | Does not contradict the PeTa model. | After the flash, a collapse occurs and then the bubble reaches a minimum size. |