FAST-ION-BEAM ATOMIC SPECTROSCOPY Toledo Heavy Ion Accelerator (THIA) Laboratory.
-
Upload
kathlyn-cain -
Category
Documents
-
view
220 -
download
1
Transcript of FAST-ION-BEAM ATOMIC SPECTROSCOPY Toledo Heavy Ion Accelerator (THIA) Laboratory.
![Page 1: FAST-ION-BEAM ATOMIC SPECTROSCOPY Toledo Heavy Ion Accelerator (THIA) Laboratory.](https://reader036.fdocuments.in/reader036/viewer/2022062407/56649f4d5503460f94c6d2dd/html5/thumbnails/1.jpg)
FAST-ION-BEAM ATOMIC SPECTROSCOPY
Toledo Heavy Ion Accelerator
(THIA)
Laboratory
![Page 2: FAST-ION-BEAM ATOMIC SPECTROSCOPY Toledo Heavy Ion Accelerator (THIA) Laboratory.](https://reader036.fdocuments.in/reader036/viewer/2022062407/56649f4d5503460f94c6d2dd/html5/thumbnails/2.jpg)
700 Li+ beam (v=4.4 mm/ns) incident on a thin (3 g/cm2) carbon foil. The blue light is H-like 4f-5g in Li2+ (4500Å, =3 ns, x=1.3 cm).
The green light is He-like 2s 3S-2p 3P in Li+ (5485Å, =44 ns, x=19 cm).
![Page 3: FAST-ION-BEAM ATOMIC SPECTROSCOPY Toledo Heavy Ion Accelerator (THIA) Laboratory.](https://reader036.fdocuments.in/reader036/viewer/2022062407/56649f4d5503460f94c6d2dd/html5/thumbnails/3.jpg)
McMaster Hall Room 1019
![Page 4: FAST-ION-BEAM ATOMIC SPECTROSCOPY Toledo Heavy Ion Accelerator (THIA) Laboratory.](https://reader036.fdocuments.in/reader036/viewer/2022062407/56649f4d5503460f94c6d2dd/html5/thumbnails/4.jpg)
![Page 5: FAST-ION-BEAM ATOMIC SPECTROSCOPY Toledo Heavy Ion Accelerator (THIA) Laboratory.](https://reader036.fdocuments.in/reader036/viewer/2022062407/56649f4d5503460f94c6d2dd/html5/thumbnails/5.jpg)
Multiplexed Simultaneous PSD Efficient detection of a range of ’s Allowed & forbidden transitions are manifest Time-dep: beam fluctuations cancel in ratios; line profiles reveal blends; bkgds obtained between lines; ANDC possible in real time
![Page 6: FAST-ION-BEAM ATOMIC SPECTROSCOPY Toledo Heavy Ion Accelerator (THIA) Laboratory.](https://reader036.fdocuments.in/reader036/viewer/2022062407/56649f4d5503460f94c6d2dd/html5/thumbnails/6.jpg)
Fast ion beams incident on a thin foil can produce highly ionized atoms like those found in
the solar corona
![Page 7: FAST-ION-BEAM ATOMIC SPECTROSCOPY Toledo Heavy Ion Accelerator (THIA) Laboratory.](https://reader036.fdocuments.in/reader036/viewer/2022062407/56649f4d5503460f94c6d2dd/html5/thumbnails/7.jpg)
![Page 8: FAST-ION-BEAM ATOMIC SPECTROSCOPY Toledo Heavy Ion Accelerator (THIA) Laboratory.](https://reader036.fdocuments.in/reader036/viewer/2022062407/56649f4d5503460f94c6d2dd/html5/thumbnails/8.jpg)
1951
King Gustav IV Adolf
Professor Bengt Edlén
Discoverer ofhighly ionized atoms in the solar corona.
![Page 9: FAST-ION-BEAM ATOMIC SPECTROSCOPY Toledo Heavy Ion Accelerator (THIA) Laboratory.](https://reader036.fdocuments.in/reader036/viewer/2022062407/56649f4d5503460f94c6d2dd/html5/thumbnails/9.jpg)
The emitted radiation from an impulsively excited level diminishes exponentially with time.
If the level is repopulated from higher lying levels, and/or is blended with light from other transitions with similar wavelengths, the decay is a sum of exponentials.
These non-orthogonal functions can be untangled by the “ANDC technique”devised in the UT laboratory.
![Page 10: FAST-ION-BEAM ATOMIC SPECTROSCOPY Toledo Heavy Ion Accelerator (THIA) Laboratory.](https://reader036.fdocuments.in/reader036/viewer/2022062407/56649f4d5503460f94c6d2dd/html5/thumbnails/10.jpg)
![Page 11: FAST-ION-BEAM ATOMIC SPECTROSCOPY Toledo Heavy Ion Accelerator (THIA) Laboratory.](https://reader036.fdocuments.in/reader036/viewer/2022062407/56649f4d5503460f94c6d2dd/html5/thumbnails/11.jpg)
Adjusted Normalization of Decay Curves
![Page 12: FAST-ION-BEAM ATOMIC SPECTROSCOPY Toledo Heavy Ion Accelerator (THIA) Laboratory.](https://reader036.fdocuments.in/reader036/viewer/2022062407/56649f4d5503460f94c6d2dd/html5/thumbnails/12.jpg)
ANDCMethod
EliminateCascading
![Page 13: FAST-ION-BEAM ATOMIC SPECTROSCOPY Toledo Heavy Ion Accelerator (THIA) Laboratory.](https://reader036.fdocuments.in/reader036/viewer/2022062407/56649f4d5503460f94c6d2dd/html5/thumbnails/13.jpg)
Because the beam foil excitation time is short compared to the uncertainty, andexcitation is anisotropic because ofthe preferred direction of the Beam,
the wave function is revealed as “Quantum Beats”.
![Page 14: FAST-ION-BEAM ATOMIC SPECTROSCOPY Toledo Heavy Ion Accelerator (THIA) Laboratory.](https://reader036.fdocuments.in/reader036/viewer/2022062407/56649f4d5503460f94c6d2dd/html5/thumbnails/14.jpg)
Differential Quantum Beat Measurements
![Page 15: FAST-ION-BEAM ATOMIC SPECTROSCOPY Toledo Heavy Ion Accelerator (THIA) Laboratory.](https://reader036.fdocuments.in/reader036/viewer/2022062407/56649f4d5503460f94c6d2dd/html5/thumbnails/15.jpg)
The lifetime of a decay is a measure of rate of depopulation of the upper level.
This depopulation may occur by multiple decay channels to lower levels.
To determine intensities of individual channels, both the Lifetime and the Branching Fractions must be known.
![Page 16: FAST-ION-BEAM ATOMIC SPECTROSCOPY Toledo Heavy Ion Accelerator (THIA) Laboratory.](https://reader036.fdocuments.in/reader036/viewer/2022062407/56649f4d5503460f94c6d2dd/html5/thumbnails/16.jpg)
Ca II
Branching fractions:VIS, IR, UV, VUVcalibrations needed
![Page 17: FAST-ION-BEAM ATOMIC SPECTROSCOPY Toledo Heavy Ion Accelerator (THIA) Laboratory.](https://reader036.fdocuments.in/reader036/viewer/2022062407/56649f4d5503460f94c6d2dd/html5/thumbnails/17.jpg)
Determination of branching fractions: Requires intensity calibration of detection apparatus as a function of wavelength
Standard lamps: continuum radiation fixed in laboratory beam light Doppler shifted
Line standards available in Visible, but not UV
Need in-beam ions with known intensity ratios
![Page 18: FAST-ION-BEAM ATOMIC SPECTROSCOPY Toledo Heavy Ion Accelerator (THIA) Laboratory.](https://reader036.fdocuments.in/reader036/viewer/2022062407/56649f4d5503460f94c6d2dd/html5/thumbnails/18.jpg)
X-ray laser
![Page 19: FAST-ION-BEAM ATOMIC SPECTROSCOPY Toledo Heavy Ion Accelerator (THIA) Laboratory.](https://reader036.fdocuments.in/reader036/viewer/2022062407/56649f4d5503460f94c6d2dd/html5/thumbnails/19.jpg)
Mission-Driven Development
and
Curiosity-Driven Research
![Page 20: FAST-ION-BEAM ATOMIC SPECTROSCOPY Toledo Heavy Ion Accelerator (THIA) Laboratory.](https://reader036.fdocuments.in/reader036/viewer/2022062407/56649f4d5503460f94c6d2dd/html5/thumbnails/20.jpg)
In 1903, the transportation industry in the US was dominated by the railroads. (Below: the Empire State Express, which set the world speed record of 112.5 mph in 1893)
Thanks to John Delos, College of William & Mary
![Page 21: FAST-ION-BEAM ATOMIC SPECTROSCOPY Toledo Heavy Ion Accelerator (THIA) Laboratory.](https://reader036.fdocuments.in/reader036/viewer/2022062407/56649f4d5503460f94c6d2dd/html5/thumbnails/21.jpg)
They had laid a 1/4 million miles of track (the distance from the earth to the moon) and were still expanding, laying down 6000 miles/year (equivalent to twice across the continent. (Below: a map of the railroads in America in 1890)
![Page 22: FAST-ION-BEAM ATOMIC SPECTROSCOPY Toledo Heavy Ion Accelerator (THIA) Laboratory.](https://reader036.fdocuments.in/reader036/viewer/2022062407/56649f4d5503460f94c6d2dd/html5/thumbnails/22.jpg)
They had over 1.5 million employees, their investment was over 12 billion in 1903 dollars, they carried 30 billion passenger-miles, and their major stations were like monuments or temples, built to last (like their industry) forever.
Their leaders were among the most intelligent, powerful, aggressive and wealthiest men in the world, and they had the power to do whatever they wanted in transportation.
That year, 1903, the first working airplane was built – by two guys from Dayton – who worked in a bicycle shop.
- John Delos