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