laaptofcires1.colorado.edu/.../presentations/trimborn_laaptof.pdf · 2018. 5. 7. · achim trimborn...
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LAAPTOFAchim TrimbornAeroMegt GmbH
80 cm / 31.5''
75 cm / 29.5''
LAAPTOF 2011
Pictures of my “latest child”
Some dates
Start of planning : 03/17/10
First deep breath : 02/22/11 (First spectra)
First delivery (BAM): 07/14/11
Instrument at Aerodyne: 09/26/11
First official presentation: 10/04/11 -Aerodyne Booth
● Limitless Absolute Awesome Particle Time of Flight Mass Spectrometer
LAAPTOF
● Laser Ablation of Aerosol Particles Time of Flight Mass Spectrometer
● Laser Ablation von AerosolPartikel Timeof Flight MassenSpektrometer
Schematic of the LAAPTOF
Triggering
Modes of Operation
● Free running laser● low chance of hitting particles● chemical information on particles down to 50 nm in diameter
● Full triggered mode● High chance hitting a particle● measurement of d
va
● Triggering on second scattering light only ( like PALMS)● High chance hitting particle● Higher probability detection a particle● no size information
+
-
4 0
3 0
2 0
1 0
arb. units
8 06 04 02 00m / z
N a+
m / z = 2 3
K+
m / z = 3 9
N a 2+
m / z = 4 6N a C l
+
m / z = 5 8
N a 2 C l+
m / z = 8 1
1 0 08 06 04 02 0m / z
5
6
7
8
9
1 0
ARB. UNITS
C l-
m / z = 3 5N a C l
-
m / z = 5 8
N a C l 2-
m / z = 9 3
Very first spectra , taken 02/22/11
Spectra
Specification
Bipolar Laser Ablation Time of Flight Mass Spectrometer for single particle detection
Particle inlet:
Aerodynamic Lens (Aerodyne, Inc): transmission for particles ~50 nm- 700 nm diameter
flow: ~100 ml/min
Particle Detection and Ionization:
Detection Laser : Wavelength 532 nm (~ 400 mW for both scattering detection beams)
Ionization Laser : Excimer Laser (ArF) Wavelength 193nm (6,4 eV), max pulse power: 1500kW
particle diameter : >150nm
Mass Spectrometry:
B-TOF (Bipolar TOF- MS) TOFWerk AG
Resolution m/Δm ~ 600- 800 (at m/z = 184)
Mass range m/z=1 to m/z ~ 2000
Size:
w x d x h: 800 mm x 750 mm x 750 mm
weight: ~ 130 kg
power consumption: < 700 W
Todo
● Measuring lots of standards
● Applying the instrument in field campagnes
● Improving the light scattering detection to smaller particles
● Changing to a particle lens transmitting larger particles
● Easy to use DAQ interface
● Build a frame work for data evaluation
AcknowledgmentThanks to Aerodyne Research Inc. for supporting the development
John Jayne for Technical/ Scientific supportDoug Worsnop for pushing on the development of the instrument
Thanks to all people at AeroMegt GmbH for helping to build theInstrument
Tabitha Schwinger
Stefanie GrünigStefan Trimborn
Thanks to Tofwerk AG
Marc GoninUrs Rohner
Mike Cubison
Last slide